Legeno, who starred in the last three instalments of the Harry Potter franchise as werewolf Fenrir Greyback, was found dead in a remote area of Death Valley, California by a pair of hikers. An official cause of death has yet to be released, but he is thought to have suffered from extreme heat-related issues.
Watson, who played female lead Hermione Granger in the films, took to Twitter.com on Saturday (12Jul14) to pay tribute to the actor, writing, "I'm so sad to hear about #DaveLegeno. He was such a lovely man. I hope he is resting in peace x."
Co-star Tom Felton, who played Draco Malfoy, added, "Gutted to hear the sad news about Dave Legeno. He was a true Big, Friendly, Gentleman. Was a pleasure every time we met #Bfg #DaveLegeno".