Presenting his defence, Vuksic said he did not know the people cited as victims in his indictment.
The trial opened on 1 November 2010, with first defendant Vuksic and second defendant Slobodan Strigic pleading not guilty. Third defendant Branko Hrnjak pleaded guilty, while the fourth accused, Velimir Bertic, pleaded not guilty.
The defendants are charged with the murder of at least six non-Serb civilians, unlawful detention, physical abuse, intimidation, terror, torture and inhumane treatment.
According to the indictment, husband and wife Adam and Ana Baric were killed on 10 October 1991, while Vinko Cicak and his sons Ivan, Ante and Mate were killed on 17 October.
Zoran Madzarac is also suspected of involvement in this case, but he is on the run.
The case was referred to the Serbian State Prosecutor's Office by the Osijek County Prosecutor's Office in Croatia in 2008, based on an agreement between the two countries on cooperation in the prosecution of war crimes, crimes against humanity and genocide.