The 94-year-old was found guilty of being an accessory to the murder of 170,000 people by a German court.
"I'm ashamed that I knowingly let injustice happen," said 94-year-old Reinhold Hanning.
Ernst Tremmel stood accused of being an accessory to more than 1,000 murders.
1. What is the latest company to pay a multi-billion-dollar settlement over claims of wrongdoing related to mortgage financing