Frank Bryce

Frank Bryce was a reclusive World War II veteran who worked as the caretaker of the Riddle family mansion in Little Hangleton. In 1943 the Riddles were murdered by Tom Marvolo Riddle (later to become Lord Voldemort), and since Bryce had the keys to the large house where the deaths occurred, he was arrested by the local city police and questioned in connection with the murders of the Riddle family, but as there was lack of evidence (because the bodies were unmarked as the Killing Curse leaves no sign of violence or damage on the victims) the police could not prove that the Riddles had been murdered, rather than dying of natural causes, and were forced to release Bryce. However, the community of Little Hangleton still believed Bryce to be guilty. As a result, he lived out the rest of his life as a pariah, isolated and living on the grounds of the Riddles' estate. It is stated that the estate passed through several wealthy but uninterested owners. The house remained unoccupied and fell into disrepair.
In the beginning of Harry Potter and the Goblet of Fire Voldemort secretly returned to the Riddle home. Bryce found Voldemort and overheard his plan to kill Harry Potter, but the snake Nagini found him and revealed him to Voldemort, who killed him almost immediately with the Avada Kedavra curse. He appeared once more in the same book, during Harry and Voldemort's graveyard duel. "Priori Incantatem," also known as the "reverse spell effect", brought back an image of Bryce from the tip of Voldemort's wand. Upon appearing, Bryce's echo encouraged Harry to keep fighting. When he appears he says, "He was a real wizard then? Killed me that one did. You fight him, boy..."
Dumbledore states his belief in Harry Potter and the Half-Blood Prince that the murder of Frank Bryce was used to create Voldemort's presumably sixth and final Horcrux, implanted in Nagini. However, Rowling later said Voldemort used the earlier murder of Bertha Jorkins for this.