When he was arrested in 2007, Zdravko Tolimir was considered the third most-wanted indictee of the International Criminal Tribunal for the Former Yugoslavia after Radovan Karadzic and Ratko Mladic.
Tolimir was Assistant Commander of Intelligence and Security for the Bosnian Serb army during the Bosnian War.
He later helped the military leader Mladic to go into hiding.
Tolimir was indicted by The Hague tribunal in 2005. The Bosnia and Herzegovina and Serbian authorities negotiated a handover in 2007.
His trial began in February 2010, following concerns over Tolimir’s health.
He had been accused of genocide, murders, expulsions and cruel treatment of Bosnian Muslims in Srebrenica and Zepa.
The charges against him said he knew about the programme to hunt the Muslim population from these areas, and he participated willingly.
According to the indictment, 25,000 women, children and old people were forced out.
Some 7,000 men were executed and buried in mass graves.
Srebrenica remains the worst massacre committed in Europe since the Second World War.
The 17th commemoration took place last July.