A 42-year-old man believed to be mentally ill lived with his mother's corpse for four days in their Shamshuipo flat until a neighbour complained about the smell yesterday. Officers were sent to the third-floor flat in Apliu Street at about 4.30pm and found the body of the 82-year-old woman lying on a bed, covered with two quilts and a plastic bag. An officer said her son was sitting calmly beside her. Police said initial investigations showed there were no suspicious circumstances.