>>87610522Voldemort was killed by himself, twice. He cast the Killing Curse on Harry and it bounced back.
He actually cast the Killing Curse on Harry no less than four times throughout the books, and it always backfired to some extent.
The Horcruxes were destroyed by Harry, Dumbledore, Ron, Hermione, Grabbe and/or Goyle, Neville and himself.