War Crimes - John Demjanjuk

In the 1980’s John Demjanjuk was known, to his friends and family, as the Cleveland grandfather. A gentle, kind soul who would always be willing to lend a hand if a neighbors bicycle was broken. However, he was accused of being one of the most violent Nazi concentration camp guards who could be responsible for the deaths of nearly 30,000 people. Was this a mistaken identity, or could he be one of the most evil men to ever walk this planet?