Mirko Sefer was born in Apatin, Yugoslavia, 1904 to Gaze. Prior to WWII he lived in Novi Sad, Yugoslavia. During the war he was in Novi Sad, Yugoslavia. Mirko was murdered in the Shoah. Place of death: Voronezh, Russia (USSR), 17/07/1942.
Zrtve Rata 1941-1945: Jevreji, Savezni zavod za statistiku, Beograd 1992 (Victims of the 1941-1945 War: Jews; State Statistic Bureau, Belgrad 1992; courtesy of the Museum of Genocide Victims in Belgrad)