A 100-year-old former prison guard at the notoriously deadly Sachsenhausen Nazi concentration camp will face trial as an accessory to murder in 3,500 cases in October, Reuters reports. Due to his age, hearings for the unnamed man will last between 2 and 2-1/2 hours a day. His charges relate to the three years he served as a prison guard, from 1942-45; some 20,000 people were murdered at the facility.