Producers behind Johnny Depp's new film The Lone Ranger have been fined by California's health and safety watchdog group over the death of a crew member on set last year.

Welder and water safety expert Mike Bridger died in September after reportedly suffering a heart attack while working inside a large liquid tank.

An investigation into the tragedy was launched by officials from the Division of Occupational Safety and Health, and now the organization has issued a number of fines to chiefs at Silver Bullet Productions.

The fines, amounting to $61,445, were handed out for a series of violations, including failure to obtain Bridger's medical records, not having a standby diver on hand when he was in the water, and allowing Bridger to dive without a tether, according to

The movie, starring Depp and Armie Hammer, is due out later this year.