NEW YORK—A Chinese immigrant who was brutally attacked in April while collecting cans in East Harlem has died of his injuries, and his case is now deemed a homicide, police said Saturday. Yao Pan Ma, 61, died Dec. 31, police said. His attack drew national attention. The investigation continues. Jarrod Powell, 49, of New York City, was previously charged with attempted murder, felony assault, and hate crime charges in the case. The Legal Aid Society, which previously represented Powell, said he is no longer a client. A message was left seeking comment with another attorney listed in court records as Powell’s lawyer. Powell attacked Ma from behind, knocking him to the ground and repeatedly kicking his head before fleeing the scene, prosecutors say. Surveillance video released by the police appears to show an attacker stomping on Ma’s head. A police detective said in a criminal complaint that Powell admitted to …