He exercised his right not to testify against a family member.
Josip Fehir came into the limelight in July last year when he disclosed the identity of his son, who had until then been treated as a protected witness.
At a news conference in July 2005, Josip Fehir called on his son "to assume the responsibility for what he had done, instead of serving as a tool of those who are trying to defame the Homeland Defence War."
The prosecution charges Glavas with having ordered the torture and murder of Serb civilians Cedomir Vuckovic and Djordje Petkovic as well as with having ordered the torture of another three Serbs.
Krunoslav Fehir claimed that his father enlisted him while he was still an under-age boy in the military unit commanded by Branimir Glavas, who was a friend of his father.
The investigative proceedings are bieng carried out before the Zagreb County Court.