In bizarre coincidences, the T-101 has died in every film. First, crushed by a press in a factory by Sarah Connor. Second film, he could not "self-terminate" and was lowered into a vat of molten lava by Sarah Connor. Third film, he sacrificed himself to kill the Terminatrix and save the lives of John Connor and Kate Brewster.
In the future, the third T-101 is the Terminator that assassinates John Connor.