Mourners file past a memorial to Cambodian artist Vann Nath.
The 66-year-old, who died September 5, was one of only seven known survivors of a notorious prison run by the brutal Khmer Rouge government.
Nath, pictured here on the right, played a key role in bringing the architects of the regime to justice.
He testified in a high-profile court case against the head of the S-21 prison, Kaing Guek Eav, also known as Duch.
He was convicted, but is appealing the verdict.
On Sunday, another survivor said he regretted that Nath will not see the outcome of the case.
SOUNDBITE (Khmer) 78-YEAR-OLD KHMER ROUGE TUOL SLENG PRISON SURVIVOR CHUM MEI, SAYING:
"It is regrettable because he was the most important person who testified at the Khmer Rouge court among the three survivors from Tuol Sleng prison, but he could not stay until the court's final sentence for Duch and to see if there will be justice."
Nath, who died from a heart attack, survived S-21 - also known as Tuol Seng - by painting portraits of Pol Pot, the head of the Khmer Rouge.
Around 1.7 million people died during the regime's rule due to starvation, illness and torture.
Andrew Raven, Reuters
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