Albert and Vicky liked to experiment sexually, so Vicky acquired a bondage kit that they could use at home. Albert put on a leather mask and, at his suggestion, Vicky tied his feet together tightly with a rope, causing him pain. He then helped her to suspend him upside down from the upstairs banister rail. Vicky then heard what sounded like a car crash in the street outside. Leaving Albert swinging, she ran out to see if she could help. When she returned to telephone for an ambulance, she found that Albert had had an attack of previously undiagnosed asthma and had suffocated. Advise Vicky about her possible liability for homicide.