Khieu Samphan was hospitalized for two weeks, from May 21 to June 5, after suffering a stroke. (Heng Sinith/Associated Press)

The former Khmer Rouge head of state is in stable condition, despite his recent hospitalization for a stroke, and can remain in the custody of Cambodia's genocide tribunal, tribunal officials said Thursday.

Khieu Samphan, 77, is one of five former senior leaders of the Khmer Rouge regime who are awaiting trial for their alleged involvement in the atrocities that occurred when their ultra-communist movement ruled Cambodia from 1975-79. Some 1.7 million Cambodians died from starvation, disease and overwork or were executed during that time.

The tribunal has charged Khieu Samphan with crimes against humanity and war crimes, and has held him since November. His trial is expected to begin later this year.

"Every day they [doctors] continue to advise us that he's fine, stable and able to continue staying in detention," said Peter Foster, spokesman for the United Nations-assisted tribunal.

Many fear that he and other defendants, some in poor health, may not live long enough to stand trial. Khieu Samphan was hospitalized for two weeks — from May 21 to June 5 — after his stroke.

His defence team has requested that he be temporarily released to receive care from his family at home, according to a report on the tribunal's website. The report quoted the defence as warning that Khieu Samphan's "conditions may progressively decline until the point of no return."

Khieu Samphan's defence team was not available to provide comment on the report.

In addition to a request for temporary release, the former leader is also appealing his detention.