"My brother was killed in 1993 by a sniper bullet when he went to collect humanitarian aid", Mladen Dabic said. "This is amazing, horrifying. My brother was running across a street and the sniper bullet came from the direction of Vrace." At the time, the Vrace neighbourhood was under the control of Serbs.
Meanwhile, as to what Dr. Dabic was doing for the past few months in Belgrade: He played the gusle at the Luda Kuca bar where
[t]he walls and bar of the Luda Kuca (the name means madhouse) are adorned with the Serb pantheon - Slobodan Milosevic, Vojislav Seselj, Ratko Mladic and of course, Radovan Karadzic - each one a nationalist hero.
As to where Dragan Dabic was heading that fateful night he was arrested, apprently he was heading on vaction.
As to the future: A good Q&A about a Karadzic trial from the NYT.