A former Nazi officer known as the "bookkeeper of Auschwitz" goes on trial in Germany on Tuesday, potentially the last SS member to face punishment after most escaped justice.

Oskar Groening, 93, will be tried on "accessory to murder" charges in 300,000 cases for his role in the deaths of mostly Hungarian Jews deported to the death camp in 1944.

His trial, 70 years after the liberation of Germany's concentration camps at the end of World War II, is the last currently scheduled for a former Nazi. While about a dozen additional investigations are ongoing, the suspects are unlikely to go to trial given their advanced age and poor health.