Mean Girl Murders S3E2 – Full Episode - video Dailymotion

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Mean Girl Murders delves into true crime stories where social circles turn deadly. This episode explores a case where friendships and rivalries escalate, leading to a shocking crime. Discover the dark side of social dynamics and the investigations that bring justice.  mean-girl-murders true-crime murder-mystery social-dynamics investigation crime-series female-criminals justice  #MeanGirlMurders #TrueCrime #FullEpisode #CrimeStories

Transcript

00:00the Bobby's were a high school sorority when you become a Bobby you become a little bit more elite

00:17some of them were nice but most of them were not nice they gave me a banana and a condom and it was

00:25just total public humiliation it was like being in a shark tank when the news spread that those

00:33screams came just before her death friends and neighbors were shocked there were lots of rumors

00:38about all the kids that dressed in black and hung out in the parking lot she wrote a note in class

00:45saying I want to see your blood drip drip drip virtual everyone I talked to is certain the

00:50killer is enrolled in this school but no one will say who it is people are pointing fingers it was

00:55almost like okay and you literally could have been sitting next to a murderer but you don't know who

01:00it is around 9 30 p.m. the doorbell rang at Alex and Mary Jane Arnold's house in Moraga California

01:24they had been playing cards with friends Alex Arnold opens the door and there's this young

01:30girl standing there and it's Kirsten Costas she looked a little nervous a little tense she was

01:37kind of freaked out she said that her friend was acting weird and could she call her mom to come pick

01:45her up 15 year old Kirsten Costas isn't far from home she lives just down the road in nearby Orinda Alex

01:56Arnold invites her in meanwhile he looks outside and they see a blonde girl standing towards the end of

02:02the driveway and there's a car parked there she called nobody answered and mr. Arnold agreed that

02:10he would drive her home it was you know like two or three miles down the road

02:15and he notices behind them this other car that was parked at the house which is this Pinto this yellow

02:29Pinto is following them with the headlights very close and he's concerned about that he says that you know

02:38who that is you know what's going on and she tells him everything's cool or not to worry about it it's no

02:45big deal but Kirsten can't quite hide her disappointment this was not how this night was supposed to turn out

02:54that night Kirsten had a secret initiation dinner with the bobbies the bobbies were a high school sorority you

03:06had to be selected to be in the bobbies the Boba links or the bobbies as we called them was not a school

03:23supported organization at all but something that you heard about when you were a freshman or a

03:28sophomore the bobbies goal was to raise money for an organization it was a group that was developed

03:38with a philanthropic goal but really it was more of a party in a social club if you were bobbies then

03:46you knew where the parties were it was competitive I'd say very competitive if you were part of the

03:51bobbies then you were part of the upper class in Irinda the bobbies it's a type of a bird and they

04:03shortened it to bobbies I don't know exactly where or why they chose a bird but that was what they did

04:10becoming a bobby could change your social steps because it's automatically going to link you to a new

04:16group of girls it's going to expose you to new people and new experiences that I think could

04:23really broaden your circles it was important what you belong to that was very important to people that

04:30living in Narenda also important to Narenda money lots of it and showing it off all you have to do is look

04:45in the parking lot at Miramonte High School and you could see 16 year old 17 year old kids driving cars

04:50that were you know 40 50 thousand dollars in the 80s I remember one kid had a Lamborghini one kid had a

04:59DeLorean it just all really screamed like money

05:04so at Miramonte High School who you associate with is worth its weight in gold and the best possible

05:17company a girl can keep is the bobbies the selection process is rigorous and arbitrary

05:25so it's kind of this legacy thing to become a bobby you have to actually be nominated by a former

05:34member and then there was a vote taken by the other members now you could be excluded for a number of

05:44reasons somebody just didn't like you or maybe they thought you liked their boyfriend just for

05:49whatever reason you didn't know if you were gonna be invited you didn't know how they were gonna pick

05:54you or if they were gonna pick you when they rang my door to give me the invitation for the bodies I was

06:01shocked I was surprised I didn't really expect it because I didn't know how they selected people and

06:08because I just wasn't 100% sure that I would be somebody they would want such exclusivity comes with a

06:17high price tag dues must be paid and the currency it's humiliation the Bobby's had some interesting

06:32initiation rituals they would come to your house real early in the morning wake you up have you dress

06:39horribly put your hair crazy put crazy makeup on and humiliate you in front of a boy that you liked

06:47then they gave me a banana and a condom and said go over to that group of senior boys with that banana and

06:56roll the condom on it right in front of them so it was just total public humiliation

07:06but it made me feel included it made me feel seen it made me feel that I was a part of a group that was exciting

07:18Kirsten Costas is a perfect prospect for the Bobby's wealthy family good grades and all the right clothes

07:31I believe Kirsten was definitely one of the popular girls she kind of looked like a doll

07:39Kirsten was like a typical California girl she was you know the sun-kissed tan and the pretty you know

07:48wavy brown hair and skinny and she had made the cheerleading team she was on the swim team she played

07:55soccer and she was just one of the in crowd her friends were Heidi and Jamie and Gigi and three

08:04girls named Stacy she was very much engaged in being a part of that whole popular crowd

08:11things did come easier to her because she was cute she had the personality she had the look she came from

08:21a good family they definitely were one of the elite and a renda for sure I believe Kirsten was a shoe-in

08:30become a Bobby so literally no one is surprised when the group taps Kirsten in June of 1984 in sophomore

08:44year the Bobby's accepted as members Kirsten Stacy Bernadette and the whole cheerleading squad

08:49Jamie was the president Bernadette was secretary Kirsten fit the mold of what a Bobby entailed everybody

09:01that was friends with Kirsten's were in the bobbies she fit in perfectly there and every

09:08kid at Miramonte knows that where you stand in the social pecking order comes down to three words

09:14location location location location at Miramonte high school you would know who was in what group by

09:24where they hung out at school like the popular kids like the Bobby's would be in the quad right in the in

09:30the center of the school where they're front and center and the stoners and the punks they'd be on the

09:36outskirts they'd be in the parking lot smoking they wanted to be completely the opposite of what the

09:50Bobby stood for I think the punk crowd separated themselves from everybody else they were intimidating

09:57to me just because I thought they were like gonna cause trouble high school is just a big soup pot of

10:05drama it's just an instant breeding ground for insecurity and it's not healthy for anyone anything could

10:13happen as Alex Arnold pulls up to Kirsten's home on Archer Road he noticed that nobody's home yet so he

10:35pulls into the driveway next door as Kirsten's walking up to the neighbor's house he sees another

10:43girl jump up from behind a hedge and start running towards Kirsten he hears Kirsten turn around and say

10:51get away from me you're weird and then he sees the other girl raise her arm and bring it down on Kirsten

10:59he kind of saw a flashing motion he thinks it's a fist fight both of the girls are screaming he sees

11:10Kirsten fall to the ground both the girls start running back towards him both girls ran past his car

11:18so he got a pretty good look at the assailant she then jumped back into her car he then saw the

11:27Pinto pull out and screech up the road Alex Arnold thinks Kirsten's okay because she's run across the

11:38street towards her house so he decides that instinct just to follow this yellow car and see what he can

11:45find out while Arnold was pursuing me Pinto Kirsten ran to her neighbor's house he had heard the screams

11:56and the noise and the noise and as he opened his door she collapsed pretty much in his arms and said

12:04help me I've been stabbed Kirsten suffered five stab wounds two to the front two to the back including

12:13one that severed her carotid artery to get her to the hospital but Kirsten didn't make it she was

12:25pronounced dead at 11 p.m. Kirsten Costas could be heard screaming for help on a driveway across from her

12:40Orinda home when the news spread that those screams came just before her death friends and neighbors were shocked

12:47and it just doesn't seem like it would happen to us

12:50I don't remember where I was when I heard about Kirsten's murder

12:57I remember seeing the newspaper and seeing her picture and just being in disbelief and shock

13:07like how could this happen how could this happen

13:10it never felt real to me you know it was it just didn't seem real you know because our parents were friends and I kind of grew up with her

13:20she was sweet

13:21the funeral was I think there was probably over a thousand people there it was very sad and it was

13:30just emotional and I felt bad I remember the parents being there and I went with my mom and my brother

13:37the Bobbies were there pretty much most everybody that was at Miramani was there the whole community kind of came together

13:46it was hard

13:51I think that initially people wanted to believe that somebody outside of Orinda did this

13:57they were thinking maybe someone over from Berkeley or Oakland where you know the hoodlums live or something like that

14:03I just don't think that people in Orinda really wanted to accept that anything could have happened from someone else in their community

14:10a massive investigation gets underway

14:14I don't believe that there was any murder weapon found at the scene

14:18Alex Arnold gave them a physical description of the assailant

14:23she was blonde

14:25fairly tall

14:26in relation to Kirsten

14:28he described the car

14:31as a mustard

14:33colored pinto

14:35didn't have the license number

14:36somebody had to be really really angry to do the kind of damage that they did to Kirsten

14:45this was a brutal attack

14:47it just doesn't seem like this could be something that was done by this young girl that people had described

15:02but teenage girls can be full of surprises

15:05the phone rings at the costa's home

15:15and Kirsten's mom answers it

15:17Kirsten is not home

15:19she's away at cheerleading camp

15:21there's a young woman on the phone

15:23who tells Kirsten's mom

15:25that there is a secret dinner for the bobbies two nights later on saturday night

15:30and to let Kirsten know

15:34the young woman does not identify herself but tells her mother that

15:38tell Kirsten not to tell anybody

15:40because it's a secret dinner and

15:42oh somebody will come and pick her up at nine o'clock

15:45and to wear something nice

15:48that phone call was apparently a phony

15:51Kirsten's girls club had in fact had its initiation three weeks before

15:56nevertheless when a gold colored pinto came to pick up Kirsten Costas on saturday night

16:01she went along

16:06they started to look at Kirsten's inner circle or people that she knew as suspects

16:11because the person that lured her out of the house

16:15knew her phone number

16:17knew where she lived

16:18knew that at the time of the call she was at cheerleading camp

16:22and also mentioned the bobbies organization

16:23i know there were rumors that jamie the president of the bobbies was possibly to blame for Kirsten's

16:31murder i know that jamie and Kirsten were having a disagreement

16:36jamie and kirsten got in an argument because kirsten said something about a guy that jamie liked

16:42that's something that caused a rift jamie was questioned they interviewed all the bobbies

16:49and they were all alibied and or polygraphed

17:03so knowing that it had to be somebody that knew Kirsten very well a lot of speculation could it have

17:09been somebody that she attended cheerleading camp with that didn't like her could it be somebody that

17:16she was on the swim team with who didn't like her maybe it was somebody that wasn't part of the

17:22bobbies it was somebody that despised the bobbies or wasn't like part of that group that did not like

17:27Kirsten did not like what the bobbies stood for and there's one name that fits that bill to a tee

17:39so nancy kane had been in the popular crowd she was kind of preppy girl early on

17:43she was even asked to join the bobbies but she turned it down she started dressing differently

17:54it was kind of startling to see the dark hair the dark makeup the dark clothes it was definitely

17:59different persona than what she was before i don't know what changed

18:02for me as a high school student miramani was like being in a shark tank

18:12it wasn't okay to be different there was a lot of judgment you needed to fit in and nancy kane

18:18intentionally put herself on the fringe and she and kirsten had known each other as kids

18:24kirsten and nancy kane became mutually adversarial they just didn't like each other

18:35and kirsten would say nasty things about nancy to her friends

18:46beef between two former bffs isn't much of a lead

18:50but investigators soon learned that nancy had recently ratcheted up the rivalry

18:57there was one incident where nancy kane wrote a note in class on a piece of paper saying i want

19:03to see your blood drip drip drip and held it up so kirsten could see it

19:08she became an immediate suspect and her hatred of the bobbies became the focus

19:14police interviewed nancy kane they asked her to take a polygraph test but her parents refused they

19:23said no that set off some alarm bells for me why would she need to tell a lie if she wasn't involved

19:33i remember at some point getting a phone call from somebody and them saying to me they think that you did

19:39it

19:49all eyes in orinda are on nancy kane did she murder kirsten costas

19:56i remember somebody saying to me okay the detectives are coming to your house to talk to you

20:01i remember the detectives coming in and sitting down and talking to me

20:08the police asked about my relationship with kirsten they asked the you know the question of was there

20:12something that happened between the two of you i remember just saying no it was fine nothing in detail

20:20they asked me what i had done the night that she was killed i told them that i went and saw ghostbusters

20:25they asked my parents if i could take a lie detector test my parents said no

20:39when they were walking out the door i asked my mom did i need to tell them the truth about where i was

20:45that night

20:53there was just so many things that i would you know after everything is said and done i look at it and

20:57i think why why was this so hard but for whatever reason it was

21:05kirsten was my friend from first grade on um till freshman year and

21:12i remember just being done with her and not wanting to hang out with her and her being confused as to

21:16why we weren't friends anymore but i was just done the bobbies was offered to me i turned it down

21:25some of them were nice but most of them were not nice i wanted to be different i did not want to be

21:32a girl like that

21:33i got looks more than anything like the up and down what's wrong with you look what happened

21:47what happened to her

21:50i loved it i loved it

21:55but kirsten didn't

21:57after nancy kane changed her look there was just this kind of unspoken rule that nobody talked to

22:04nancy kane anymore she wasn't part of the group she was on the outs

22:10i sat probably three rows back from kirsten in biology i can picture it in my head right now

22:16and you know she would turn around and look at me and i was like behind her plotting and planning

22:22and you know thinking to myself what an asshole she was i wrote on my notebook i want to see

22:31her blood drip and i was referring to kirsten

22:35i just wanted people to know that i didn't like her at all

22:40at the time she was not nice she wasn't kind she made people feel bad she was the epitome of what i

22:47didn't want to be

22:55kirsten definitely unfortunately had sort of a bullying mentality she was very charismatic she had

23:04a big vivacious personality and that gave her a lot of power and she used it

23:11if she didn't like you she was very direct so i felt very much on my toes sort of to make sure that

23:21i watched what i said it's actually hard for me to hear that because i didn't know her that way

23:30that's not the kirsten that i remember she wasn't always the nicest but i don't think

23:35she really was intentionally trying to be mean or mean-spirited kirsten's personality was i think

23:42she was kind of shy and maybe that took it as being a little bit stuck up people are gonna think

23:50she's rude she's bitchy she's mean it's just part of that social hierarchy of being the one who's the

23:56top dog i mean being 15 16 is difficult already and kirsten did not have to try to be popular she just

24:06was i think she had a little bit of what i wanted in life

24:11i had told my parents that i was going to the movies with a friend the night of the murder and

24:27that's not what i did i told the detectives that because i didn't want to get in trouble

24:32with my parents for lying so we got them to come back in and i told them the truth

24:40i was at a boyfriend's house and i didn't want my parents to know

24:46they talked to my boyfriend's mother so she could confirm that i was there thank god

24:52once they cleared me i felt relief but things changed so drastically that that was kind of short-lived

25:01in this community where image is everything rumors speak louder than facts the rumor mill went crazy

25:14and people thought of all sorts of things i felt like anytime i went anywhere in orinda

25:20that there were whispers people thought i took pcp and didn't remember killing her it just got more and

25:27more far-fetched

25:33nancy is not a suspect but her story focuses investigators on kirsten's reputation for

25:40unintentional casual cruelty and that's when another suspect emerges helena hinton was one of the

25:50outsiders she was quiet meek pale and they teased her you know they teased her they teased her the way

26:01she dressed the way she looked she was an easy target easy target i heard one time kirsten yelled

26:10at helena and helena ran to the bathroom and was crying

26:14and you know hurt hurt her it was mean when helena was in the bathroom she said i could just kill kirsten

26:32another suspect in the murder of kirsten costas walks the halls of miramonte high school

26:38but helena hinton isn't much of a match to the knife-wielding assailant helena hinton did long

26:46black hair and didn't fit the physical description at all her alibi was confirmed immediately she was

26:54eliminated pretty quickly the police were running out of suspects they didn't know who did it there was

27:00nothing they had nothing

27:15at miramonte high it's the first day of school and kirsten is not forgotten it's kind of hard to forget

27:20a friend when we started junior year there were a number of girls missing some of the girls were

27:28friends of kirsten and they just couldn't come back because they were so devastated i know nancy never

27:35returned the principal of miramonte told my parents i couldn't come back to miramonte

27:40i had to go to a different school because there was no suspect so i became the scapegoat

27:48people were pointing fingers it was almost like okay we're going to school with a murderer but

27:52you don't know who it is you literally could have been sitting next to a murderer you didn't know

27:56it's the possibility that the killer may be a neighbor or a classmate that's most upsetting to

28:01people here several of the parents we talked to refused to be on camera because they were afraid

28:05the killer would see them and then retaliate against their kids

28:08it's been three months and there's no leads the investigation had gone completely cold the costases

28:24hold a press conference today art and barrett costas talked to the press for the first time

28:30since their daughter kirsten was murdered their decision to be interviewed based partly on frustration

28:35it's time that we got an answer as to why this person or persons needed to do this to kirsten

28:45i was hired by the costases and just tasked with taking a look and and reviewing and

28:53seeing if i could bring a fresh perspective to the case

28:56they felt that kirsten's killer was right there and that the police were just not doing their job

29:1115 year old cheerleader kirsten the media coverage was crazy it was you know it was on the news

29:19obviously there was the contra costa times where it was on the cover of that all the time um

29:23rolling stone had called people magazine covered it ladies home journal yeah it was everywhere it

29:30was everywhere after an entire summer of searching under an intense media spotlight

29:37the orinda police department decides to call in the big guns the sheriff involved in the case and i

29:45were pretty good friends and so when he called me and asked if we could do something

29:50i decided to ask our crime unit at quantico to do a criminal profile of the case

29:56what the criminal profilers do at the fbi academy they take information from a police department

30:04fill out a very very detailed report on the crime scene primarily

30:10and from that information putting it all into computers and that sort of thing

30:14they can come up with a profile of the probable person that was the perpetrator of the crime

30:22it's not perfect but it's very very sophisticated and it can be quite accurate because most of the

30:29guys there that quantico are master's degree in psychology and it is a little bit speculation but

30:35it's still very helpful they compiled the report and they said that the crime had been undoubtedly

30:47committed by a young woman probably a friend of the victim who would be driving a small car

30:55they also thought it might be somebody who felt like they were inferior or didn't fit in some way or

31:01weren't accepted by kirsten

31:09that isn't news to anyone who has been following the story for the past five months

31:14but what comes next is a game changer

31:17they did say as i recall that the perpetrator would come from a catholic family with six children

31:30using this fbi profile investigators went back to their interviews and looked at the possible

31:37suspects and one person who fit the profile almost exactly was bernadette proddy

31:41bernadette proddy was a 15 year old sophomore at miramonte she was smart she was blonde everybody

31:53thought she was just a nice girl bernadette and i went to catechism together her mom was very religious

32:00and i knew that she was the youngest and that her five siblings were much older and she didn't

32:06have the look of the popular girls she wasn't crisp she was just plain she was not vibrant at all nice

32:18but not vibrant but she was trying she definitely tried bernadette didn't really fit the personality

32:27of the girls that were normally asked to be a bobby but bernadette was invited by her good friend jamie

32:34and jamie was the president she had tried by trying out for cheerleading and she didn't make that

32:41she had tried to be a part of the yearbook committee and she wasn't accepted into that

32:46so i think bobby's was probably a really big deal for her because it meant that she had been accepted or

32:52included

32:55and bernadette has the one thing that investigators have been looking for since the night of the murder

33:01the family did own a yellow ford pinto

33:09it really fit her to the t but the sheriff said well she passed a polygraph

33:17that's when i went back to quantico and and the guy at quantico said oh she'll pass a polygraph

33:22a polygraph because she has put the crime to sleep in her mind if you will re-polygraph her about the

33:31improper use of the family car that night

33:44bernadette was brought back in for another polygraph examination this time the examiner was fbi agent ron

33:50hilly he asked her again the question she'd been asked before she still said that she had not killed

33:57kirsten she didn't know anything about it but then he took her through the fbi profile and at the end of

34:03that very detailed profile bernadette was silent for a moment and then said you think i did it and he said yes

34:12yes she said well is there something we have to wrap up right now he goes no we can we can talk more

34:19later and she said okay thank you and left she wanted very much to talk to her mother and it was

34:26decided that she wasn't going any place so she was allowed to go home

34:30bernadette got ready for school

34:42she left the letter on the counter and she told her mother don't read it for 30 minutes

34:47and then she left for school

34:51bernadette's mom set her timer for 30 minutes and then she opened the letter

34:55and when she opened that letter it changed their life from that moment forward

35:09the letter was a confession letter she wrote to her mother the fbi man thinks i did it and he's right

35:30her mom came and picked her up at school and they went down together to the police station

35:34where she confessed

35:42bernadette told her parents that she had a babysitting job that night

35:46but bernadette drove to kirsten's house honked the horn kirsten came out and she saw that it was

35:52bernadette and she said oh it's you when kirsten said you know oh it's you i can imagine that it just

36:00fueled bernadette's feeling of inadequacy and loneliness bernadette told her hey there is no

36:08initiation dinner we're gonna go to a party so she got in the car and they started driving

36:17bernadette claimed that kirsten wanted to stop at a church parking lot to smoke marijuana

36:23they stayed there for a while bernadette was talking to kirsten

36:26and was just trying to convince her to be her friend to accept her that was something that was

36:32really really important to bernadette

36:36and she was almost pleading with her kirsten seems to have lost patience with that and finally just

36:44said what are you like in love with me or something or something to that effect which really made bernadette

36:50angry so then kirsten says you're weird leaves the car and starts walking across the street i rang the

36:59doorbell of alex arnold and bernadette followed them in the car bernadette realized that if kirsten

37:07went to school the next day and told everybody that bernadette was weird she would have lost her status

37:13and maybe she could have got kicked out of the bobbies

37:20by the time kirsten arrives home in orinda bernadette's fear of being humiliated has morphed into white hot rage

37:30when she saw her go up to the house she reached under the seat she said there was a knife under the seat

37:36of the car the knife was her sister's knife a butcher's knife she kept it in the car because she

37:44ate lunch in the car

37:58i think kirsten said something mean to bernadette and i think it was almost like it took over or

38:15something and it just made her do a crazy thing so i remember when we heard that it was bernadette

38:31we were floored we we were completely shocked i would have never thought it was bernadette that

38:37would have never crossed my mind it's horrible to say that but it seems like i know why nancy and helena

38:43got you know accused because they would fit the mold right bernadette wouldn't i was so angry i felt

38:52betrayed bernadette and i sat next to each other i lost all of my friends because nobody knew whether

39:00or not i had killed somebody because there was no suspect that ruined my life and i'm still angry that

39:08she let that happen on march 13 1985 almost nine months after kirsten costas was stabbed to death

39:20in front of her childhood home now 16 year old bernadette proddy is convicted of second degree murder

39:28she is sentenced to a maximum nine years in prison

39:32it's the most a minor can receive in california and orinda is left to come to terms with this

39:39terrible teenage tragedy

39:47i mean being popular at marimani was important but it's definitely not worth killing somebody over

39:53i think it would be easier to accept if it was an outsider maybe even somebody outside of the

39:59community would probably be what everybody really wanted to be the answer and it just wasn't the

40:06bobbies changed their name we changed it to the kestrels and we stopped the hazing there was no public

40:12humiliation

40:19high school is a breeding ground for insecurity but i don't think any of us had the feeling like you know

40:25i'm going to kill her what is actually even happening here what does that mean about all of us

40:32i just feel bad i feel bad for kirsten who's the mean girl yeah it doesn't matter in the big scheme of

40:38things she lost her life and and her parents had to go through all that and they're still going through

40:47it because it doesn't go away it shouldn't have happened it's terrible it's just awful

40:55i feel like kirsten's remembered as a good person somebody that would be successful and came from

41:00a good family what happened to her was really sad

41:11on the next mean girl murders working at the cookie factory i mean it was rough i had no respect

41:17for her she had started a war that a friend could do this to another friend is incomprehensible she kept

41:24screaming she's gone i know who killed the woman in perry

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