In recent weeks, the media has aired Serbian police videos showing the excavation of three mass graves just 10 miles from Belgrade. Serb police say the bodies of 2,000 ethnic Albanians, mainly women and children, were transported from Kosovo two years ago and burned or buried on Milosevic's orders.
Milosevic was indicted by the tribunal in The Hague in May 1999, charged with crimes against humanity and accused of responsibility for atrocities committed during the Kosovo conflict.
Tribunal prosecutors have said they also plan to charge him for war crimes committed in Bosnia and Croatia.
At The Hague, Milosevic is expected to reside in a single-room cell like other detainees. Although the prosecution team has said it is ready to go to trial, the defense team is expected to take a few days before it makes its case.
Milosevic faces a maximum sentence of life in prison.
ABCNEWS' Barbara Starr in Washington contributed to this report.