Legeno died during a hiking accident in Death Valley, California. His body was found Sunday by two hikers "in a remote wash" below Manly Beacon, west of Zabriskie Point in Death Valley. The area is so remote that a Highway Patrol was called in to transport the body.
The Inyo County Sheriff's Department confirmed to TMZ this afternoon after an autopsy that Legeno died of heat stroke. Temperatures in the area can reach up to 120 degrees. County Deputy Coroner Jason Molinar reported his body was partially decomposed when found and he may have been dead for three to four days prior.
In addition to the "Harry Potter" films, Legeno was a successful MMA fighter after starting his career at 42--before he began his film career--and went by the name The Enforcer. He also starred alongside Brad Pitt in 2000's "Snatch." He also played a League of Shadows warrior in "Batman Begins," as well as roles in "Snow White and the Hunstman," "Emmerdale," and "EastEnders."
Legeno was scheduled to star with fellow "Potter" costar Rupert Grint in the upcoming "Enemy of Man."
Costar Tom Felton, who played Draco Malfoy in the "Potter films," tweeted, "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."
He lived in south England and is survived by a daughter, reported to be in her 20s.