However, reported evidence suggested that his death was accidental, the result of autoerotic asphyxiation. These include autoerotic asphyxiation and self-bondage. He is shown engaging in autoerotic asphyxiation during masturbation. He acted out sexual fetishes for voyeurism, autoerotic asphyxiation and cross-dressing. The sensational nature of autoerotic asphyxiation often makes it the subject of urban legends. The astronauts were killed by asphyxiation, smoke inhalation, and thermal burns. His death was the result of an apparent accidental asphyxiation. Death is thought to be caused by cardiac arrest rather than by asphyxiation or crushing. The cause of death became widely accepted as "accidental asphyxiation". Nerves now constantly transmit signals and cause excessive muscular contraction, leading to asphyxiation and death. Propane does not have health effects other than the danger of frostbite or asphyxiation. Ethane can displace oxygen and become an asphyxiation hazard. These include erotic asphyxiation and self-bondage. The death was linked to positional asphyxiation. Most of the deaths were from asphyxiation or trampling.