There are so many ways to die in space, including the actions of other crew members: "If you were flying on the Shuttle and saw the lock, how would you feel? A good crew is a well-bonded crew. The commander locking a hatch essentially sends a message to the others: 'I don't trust you to not kill us all in flight.'"
What happens when an astronaut in orbit says he’s not coming back?
"If you guys don't give me a chance to repair my instrument, I'm not going back."
arstechnica.com