During the Tournament 's final challenge , Harry and Cedric are teleported to a graveyard . Cedric is killed , and Lord Voldemort , aided by Peter Pettigrew , uses Harry 's blood in a gruesome ritual to resurrect Voldemort 's body . During the Tournament 's final challenge , Harry and Cedric are transported to a graveyard , using a portkey , where Cedric is killed by Peter Pettigrew , and Voldemort , aided by Pettigrew , uses Harry 's blood in a gruesome ritual to resurrect his body .