The last-known Nazi concentration camp guard who “helped kill thousands” has died aged 100. Gregor Formanek, a former SS guard at Sachsenhausen concentration camp, died just before he was due to face trial in Germany.

Formanek, a guard during the Holocaust, was set to be held accountable for his alleged role in one of the Third Reich's most horrific killing machines. He was charged last year with helping to murder 3,300 people at the notorious WW2 prison near Berlin, including prisoners of war, jews and political detainees. His crimes ran from July 1943 to February 1945. Formanek, who was a teenager during his time at the camp, was ruled fit enough to face trial by German officials last year.