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The Hague Tribunal, where Dunjic was due to testify.

The International Criminal Tribunal for the Former Yugoslavia said that Dunjic died on Thursday in a hotel in The Hague and that a court official found the body, while the cause of death is being investigated.

“Emergency services personnel were immediately notified and ascertained Mr. Dunjic’s death. Dutch authorities are conducting an investigation into Mr. Dunjic’s death,” the tribunal said in a statement.

Mladic, the wartime commander of the Bosnian Serb Army, is on trial for genocide against about 7,000 Bosniaks from Srebrenica in the days that followed the occupation of the town on July 11, 1995.

Mladic is also charged with the persecution of Bosniaks and Croats throughout Bosnia and Herzegovina, which allegedly reached the scale of genocide in six other municipalities, terrorising the population of Sarajevo and taking UN peacekeepers hostage.

Dunjic has previously testified as a defence expert in several other cases at the Hague Tribunal.

In his testimony at Radovan Karadzic’s trial in 2013, Dunjic said that there was “firm evidence” that only “450 to 500” bodies exhumed from mass graves linked with the fall of Srebrenica in July 1995 were victims of shooting.

Mladic’s trial resumes on Monday.