A black teenager shot 16 times by a white Chicago police officer was a ward of the state when he died, having spent years being shuttled between different relatives' homes and foster care from age 3.

Laquan McDonald, whose name demonstrators have shouted for two days, lived a troubled, disadvantaged life and had at least one previous brush with the law, Illinois Department of Children and Family Services' records show.

School officials and the McDonald family lawyer say there were signs Laquan was trying to get his life in order, though prosecutors say he had drugs in his system and was burglarizing cars the night he died.

Protesters and civil-rights activists are demanding more investigations and police reform. - AP