After he shoved a knife through his sister’s chest and his mother’s back as the family cooked dinner last December, Samuel Pattillo walked naked down the yellow line of a residential Dedham road. He was dead in police custody an hour later.

Police officers were justified in their use of force on a man who died in police custody last year after two of his adult relatives were stabbed at a home in Dedham, Massachusetts, according to the final report from the Norfolk District Attorney's Office.