Authorities in West Virginia say a star "Buckwild" Shain Gandee and two passengers all died of carbon monoxide poisoning.
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Twenty-one-year-old Shain Gandee, whose nickname on the MTV show was "Gandee Candy," and 2 other men were found dead on Monday.
Gandee's 1984 Ford Bronco was stuck in a mud hole with its tail pipe submerged. It's possible the gas could have filled the cabin because of the clogged exhaust pipe.
The Kanawha County Sheriff's Department says autopsies completed Tuesday confirmed the Gandee, his uncle and another man died from the gas.
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Their deaths have been ruled accidental. The victims' bodies have been released to funeral homes, but no arrangements have yet been announced.
Shooting for the second season of the show set around Sissonville and Charleston has been suspended.
Shain Gandee went missing with his uncle and another man after leaving a bar at 3 am Sunday, according to WBOY-TV.
The men were heading out of the bar in Sissonville at that time and were telling friends they were going to go "four wheeling" (or "muddin" as it was known on the show) in Shain Gandee's Ford Bronco, the TV station reported.
David Gandee, age 48, was also found dead with his nephew, the TV station reported. Another man was found, but the identity of that person has not been released.
The three bodies were found in a Ford Bronco in a ditch on Wolf Pen Road, which on the TV show has been identified as the area around Gandee's home.
Gandee, age 21, was seen on the show Buckwild where he had a part-time job as a garbage man, although it is not clear how much work he actually did while on the show. Some media reported that he quit his garbage collection job before show taping ever began.
On the last episode of the first season, Gandee had a romantic relationship with one
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of the female cast members, Cara Parrish. Gandee's fiery sign created for Parrish moved her enough for the two to kiss by the lake.
MTV recently renewed the show for a second season, but now at least three cast members will not likely be back for that season.
Cara Parrish moved to North Carolina and she said recently that it was unlikely that she would be on the show again. Another female cast member, Salwa Amin, was recently arrested on drug possession charges.
Amin, age 24, was charged in February with two counts of drug possession with intent to deliver and initially jailed on $200,000 bond. Defense attorney Michael Callaghan got that reduced to $100,000. She's now being held without bond.
Callaghan didn't immediately return messages, but a jail official says a warrant shows Amin violated the release conditions by failing to appear in court.
The Associated Press contributed to this report.