Quebec's worker health and safety commission is trying to determine exactly what killed a worker at the Ventrol ventilation plant in Anjou last evening.
Urgence Santé says it got a call at around 9 o'clock about an unconscious man at the facility.
The 53-year old was declared dead a short time later. Two co-workers who tried to help him were treated for nervous shock..
The thee men were working on a ventilation pipe. The man who died may have been overcome by fumes.