[Suicide Junkie]

Just assume that the surviving crew have spacesuits or something, and they can get air tanks from their supply storage.

If all else fails, you could probably set an autopilot, or use remote controls from any nearby ships/planets. The computer/autopilot is not designed to handly the entire ship alone like a full MC is, and remote control of a ship would have a speed-of-light delay plus limited feedback.