Charcoal-burning suicide is suicide by burning charcoal in a closed room or area. Death occurs by carbon monoxide poisoning.

Charcoal-burning suicide – Wikipedia

Do not leave live coals from a fireplace or a charcoal grill inside an enclosed space. CO poisoning is highly possible if this is done, even accidentally.

If cleaning out a grill, fireplace or wood stove, take the ashes outside in a METAL container. Do not leave it inside.