He was a SS Waffen lieutenant. During WW II. He was one among the team that committed brutal killings of 550 Civilans including 119 children in the village S ant Anna Stazz ema .. Tuscany in I tally while withdrawing against the allies. The women were made to kneel infront of the church and pray before they were shot dead. An Italian prosecution team framed charges against him and in absence was sentenced to death by a court.But, the German court found that there was no evidence of charges against him. Germany did not extradite him. Sommer at the age of 93 years lives in a nursing home in Germany near Hamburg and suffers severe Dementia and can not stand trial. However as per some quarters the suffering of Dementia was faked. The person goes unpunished.