The Yugoslavian Wars
During a mission of the squad, Dmitar was killed, alongside eleven of his fellow squad members, after Darko sold the squad out to the enemy for $1,000.
Dmitar's death, alongside his fallen friends, lit revenge inside Niko. Niko tracked down Florian, in Liberty City, and revealed that Florian is homosexual, and changed his name into Bernie. Niko learns that the traitor is Darko Brevic. Niko managed to bring Darko into Liberty City, with the help of United Liberty Paper. Niko then has the choice to kill or spare Darko.