By Brendan O’Brien (Reuters) -A Black man who was killed by a Grand Rapids, Michigan, police officer during a traffic stop earlier this month, sparking protests in the city, was shot in the back of the head, a forensic pathologist who performed an independent autopsy said on Tuesday. During a news conference in Detroit, forensic pathologist Werner Spitz and attorneys for the family of Patrick Lyoya said the autopsy found the 26-year-old was shot once and that the police officer held his gun to the back of Lyoya’s head. “That is now scientific evidence of this tragic killing where his family be…