If the player picks Ending A (Something Sensible) for the final mission, Michael and Franklin will chase down Trevor and kill him. He gets doused in gasoline when a fuel tank breaks open. He then gets shot by Franklin or Michael which ignites the gas and causes Trevor to burn to death.
Due to the violent way Trevor died, some players believe his ghost can be seen at his trailer in Sandy Shores, where his red eyes peer out the kitchen window. The haunting is said to occur exactly 2 A.M. for one second. So far there is little evidence to support this claim. It is thought that if the player saw Trevor's Ghost the player character would instantly be caught on fire and die promptly.