The former Marine shot by cops in his apartment died from a single bullet that entered his right arm and ripped through both lungs, according to an autopsy report obtained by the Daily News. The lawyer for Kenneth Chamberlain’s family said the autopsy contradicts the police account of his death. Cops say Chamberlain, 68, was advancing toward police with a butcher knife on Nov. 19 when White Plains Police Officer Anthony Carelli fired two shots to stop him. Randolph McLaughlin, attorney for Chamberlain’s family, said the trajectory of the fatal bullet suggests Chamberlain was neither facing the police nor holding up a weapon.