Szerynski was a Jew-hating Proselyte appointed by Adam Czerniakow as head of the Jewish Police. He was caught smuggling furs that should have been confiscated and was arrested by the Gestapo, but was released before the Great Aktzia. During the Aktzia, he was seriously injured by Israel Kanal, a member of the Jewish Fighting Organization, who had been sent to assassinate him. After the assassination attempt, Szerynski escaped from the ghetto and hid in the Polish sector. He committed suicide during the minor uprising in January 1943.
Sources: Dor, Danny, Ed. Brave and Desperate. Israel: Ghetto Fighters' House Museum, 2003.