sentences:  He tried to communicate with the arriving ambulance workers, who rushed him to the Huntington Memorial Hospital, where he was declared dead approximately thirty-seven minutes after the explosion.When his mother, Ruth, learned of his death she immediately took a fatal overdose of barbiturates.Pasadena Police Department criminologist Don Harding led the official investigation; he concluded that Parsons had been mixing fulminate of mercury in a coffee can when he dropped it on the floor, causing the initial explosion, which worsened when it came into contact with other chemicals in the room.