The Riddle family was killed by Tom Marvolo Riddle, the estranged member of the family who later went on to rename himself as Lord Voldemort. Tom Riddle Sr. had abandoned his wife, Merope Riddle, and his newborn son Tom Marvolo Riddle after he realized that Merope had tricked him into marrying her using a love potion. This enraged Tom Marvolo Riddle when he heard about it from his uncle Morfin, and he therefore, killed the Riddle family as an act of vengeance.