The suspected Nazi war criminal who served as a gendarmerie captain during the war, had been charged by prosecutors with alleged involvement in the anti-partisan raid in the Serbian city of Novi Sad, then under Hungarian control, on January 23, 1942. Mostly Jews and Serbs were killed. Képíró returned to Hungary in 1996 after decades in Argentina. Some 1,246 Jews, Gypsies and Serbs were killed between January 21 and 23. Képíró, who was at one time named by the Simon Wiesenthal Center as the organization's most wanted Nazi war criminal, fled to Argentina after the war, before returning to Budapest in 1996, where the Simon Wiesenthal Center tracked him down in 2006. Képíró was acquitted in July in a trial at the Budapest Municipal Court, but the prosecution appealed the decision. The court case was considered one of the last of the Nazi war crime trials, due to the likely age of any defendants. Képíró, who returned to Hungary from exile in Argentina in the 1990s, claimed innocence throughout the trial.