Mom Used Hibachi Grill Inside to Kill 8-Year-Old Son, Attempt Suicide, Say Boston Area Police

QUINCY, Massachusetts (CBS/AP/WBZ) A woman was arraigned in a Boston hospital bed Friday on accusations that she killed her 8-year-old son and tried to commit suicide by lighting a hibachi grill in a bedroom in their apartment.

Li Rong Zhang was arrested one day after her teenage son found her and another son, Brandon Yang, 8, unconscious in their home in Quincy, south of Boston, authorities said.

Zhang remained hospitalized under guard after she was ordered held without bail on a murder charge.

Firefighters who broke through a barricaded door into a second-floor room found the younger boy lying on the bed and his 39-year-old mother on the floor Thursday afternoon, Norfolk

District Attorney Michael Morrissey said.

Investigators have determined that there were no problems with the heating in the apartment and there was no indication the hibachi grill was being used for heat. It also didn't appear that anything was being cooked on the grill, Quincy Police Chief Paul Keenan said.

The poisonous carbon monoxide fumes from the grill were mostly confined in the barricaded bedroom and did not reach smoke detectors elsewhere in the apartment, Keenan said.

The woman's attorney, James Doyle, said a not-guilty plea was entered on her behalf.