During the 1990s Bosnian war, Simsic was a guard in a detention centre located in a school in Visegrad, eastern Bosnia, where Bosnian Muslim civilians were mistreated and killed, East Sarajevo Public Security Centre spokesman Radovan Pejic said.
The voluntary surrender ensued after months of negotiations between the Interior Ministry and Simsic's family, said Pejic.
Simsic was employed with the Visegrad police until 15 October 2003.