ACTON ( — Authorities Monday identified three men who were killed in a helicopter crash over the weekend.

The Los Angeles County Coroner has identified the victims as pilot David Gibbs, 59, of Valencia, 46-year-old Darren Rydstrom, of Whittier, and Michael Donatelli, 45, of Pennsylvania.

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The fatal crash happened just before 4 a.m. Sunday in the 5700 block of Soledad Canyon Road, officials said.

(credit CA DMV)

(credit CA DMV)

The helicopter went down on Polsa Rosa Ranch — an area typically rented out by film crews. Investigators say the production company, Eyeworks USA, had rented the chopper to be used as part of a military-based reality show for the Discovery Channel.

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Eyeworks USA is best known for creating “The Biggest Loser”.

It’s not known if the accident happened during filming for the show.

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The National Transportation Safety Board, Federal Aviation Administration and law enforcement agencies are investigating the cause of the crash.