The three all lance corporals in the Corps were found by a fellow Marine after one of them failed to show up to the airport in Oklahoma, triggering a search that led authorities to a Speedway gas station 50 minutes south of the base.
The Pender County Sheriff's Department told Military.com the carbon monoxide "likely" came from some malfunction in the Lexus where the Marines were found, but that it could not say for sure.
3 US Marines died of carbon monoxide poisoning in a car. Vehicle experts explain how that can happen kcrg.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from kcrg.com Daily Mail and Mail on Sunday newspapers.