The tribunal allows “civil parties,” or victims of the regime, a measure of participation in trials.
An estimated 500,000 Cambodian Muslims died under the Khmer Rouge, through overwork, starvation or execution.
The Documentation Center of Cambodia says it has performed around $300,000 in unrecognized work for the UN-backed Khmer Rouge tribunal.
Helen Jarvis, head of the unit since April 2009, is said to leave on the 30th of June.
Exhibitions and talks can help people understand the plight Cambodians faced when the Khmer Rouge came to power.
Theater drama aimed at getting people to talk about their trauma under the Khmer Rouge.
All four defendants are approaching the three-year limit on provisional detention.
International donors for the Khmer Rouge tribunal are scheduled to meet in May to decide about funding.
Ly Sukei’s father was a well-educated Cambodian Muslim who died at the hands of the Khmer Rouge in 1975.
The tribunal’s office of the prosecution is now preparing for trials of at least four more leaders of the regime.
On Monday, the U.S. Embassy in Phnom Penh said that military scientists tested the remains and found they are not Caucasian.
Four died in the ambush on National Road 3 on May 31, 1970, and five more were executed as prisoners.