Harry Potter Villain Found Dead in Desert Actor David Legeno played werewolf Fenrir Greyback By John Johnson, Newser Staff Posted Jul 11, 2014 5:55 PM CDT 15 comments Comments David Legeno appears as Fenrir Greyback in 'Harry Potter and the Half-Blood Prince.' (Warner Bros.) (Newser) – He was a 6-3, 250-pound former mixed-martial arts fighter who went on to play a villainous werewolf in the Harry Potter movies, but even David Legeno was no match for Death Valley. The 50-year-old actor was found dead in the place known to be the hottest on Earth last weekend, reports the Los Angeles Times. Authorities don't suspect foul play. TMZ reports that Legeno had been hiking and that the autopsy attributes the cause of death to heat stroke. He is best known for playing Fenrir Greyback in the Potter films, though he also appeared in the movies Snow White and the Huntsman and Snatch, notes E! Online.