QUETTA - A couple breathed their last due to suffocation on Friday in Pishin district, some 45 kilometres away from Quetta. According to police, the incident took place in Killi Tarta of Pishin as Muhammad Ibrahim went to sleep without switching off the roomheater that consumed all oxygen. Resultantly, he and his wife suffocated to death. Police shifted the bodies to a hospital for autopsy and later handed them over to the heirs for burial.