Sinatra began to show signs of senility in his last years and after a heart attack in February 1997, he made no further public appearances. After suffering another heart attack, he died at 10:50 pm on May 14, 1998 at the Cedars-Sinai Medical Center, with his wife Barbara by his side. He was 82 years old. Sinatra's final words, spoken after Barbara encouraged him to "fight" as attempts were made to stabilize him, were "I'm losing". The official cause of death was listed as complications from senility, heart and kidney disease, and bladder cancer. His death was confirmed by the Sinatra family on their website with a statement accompanied by a recording of the singer's version of "Softly As I Leave You". The next night the lights on the Las Vegas Strip were dimmed for 10 minutes in his honor.
(extract from Wikipedia 2011)