Milosevic, 64, was found dead in his cell at the ICTY detention unit in the Hague district of Scheveningen on Saturday morning. He had suffered from chronic hypertension.
Meanwhile, the ICTY said that the autopsy was completed at the Dutch Institute of Forensic Medicine in The Hague on Sunday evening.
The autopsy has been concluded. We are waiting to see if we get the results, and if we do, we will issue a statement, ICTY spokeswoman Alexandra Milenov told reporters.
Television crews waiting outside the Institute filmed a car with two Serbian pathologists from the Belgrade-based Army Medical Centre (VMA) leaving shortly before 2000 hours.
The autopsy should have started at 1300 hours but was delayed for two and a half hours to instal a camera to record the course of the examination, unofficial sources at the Hague tribunal said.
Serbia and Montenegro's Defence Minister Zoran Stankovic, a forensic medicine specialist and former director of the VMA, said in Belgrade in the evening he expected the results of the autopsy to be available in the next few days.
Stankovic explained that it takes 24 to 48 hours to complete the pathohistological analysis of tissue samples and another 24 hours for chemical and toxicological analysis.