The unnamed 48-year-old diver is thought to have suffered a heart attack while cleaning out a pool that was going to be used in the film.
He was pronounced dead on Friday according to the coroner’s spokesman.
Walt Disney studios said: “Our hearts and thoughts are with his family, friends, and colleagues at this time.”
Spokesman Paul Roeder added in a statement: “Our full support is behind the investigation into the circumstances of this terrible event.”
Police revealed the man had been wearing scuba equipment to carry out maintenance on a deep pool on a ranch near Palmdale, in the desert north of Los Angeles, where the Western is being filmed.
It is thought he was preparing a tank for an underwater scene to be shot at a later date.
The Lone Ranger, due to be released in July 2013, is a remake of the classic adventure with Johnny Depp as Native American spirit warrior Tonto and Armie Hammer in the title role.
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