in the summer of 1995 when Harry Potter was taking part in the last part of the trial wizard tournament he stumbled across a port key but didn't know it was a port key so tapped it and he ended in a grave yard where he stumbled across Voldemort and Voldemort killed Cedric digory. Voldemort tried to kill Harry but was unsuccessful as their wands connected and Harry got away with Cedric digorys body