An American family of four holidaying in Mexico have died after becoming overwhelmed by toxic gas inside their rental condo.
Quintana Roo's state attorney said the results mean any suggestion of foul play or suicide has been ruled out.
Authorities found the bodies of Kevin and Amy Sharp and their two children on Friday at a rental condominium in Tulum, which is located southwest of Cancun.
The gas that killed the family hasn't yet been determined but firefighters have launched an investigation.
New images show the inside of the beach-side condo. The office said that investigators "carried out a physical investigation of the gas connections in the room" and that the civil defense office of Tulum would issue a technical report on the findings.
Kevin Sharp and his wife Amy, along with their son Sterling, 12, and daughter Adrianna, 7, were found dead in their condo while on vacation in Tulum, Mexico.
Jane Matthews was killed by two blows to her head with a hammer by her husband during a row last July.
Jane Matthews Facebook
But although the lack of communication was unusual, Peterson said, the family wasn't immediately alarmed when the Sharp family did not return on Wednesday as planned.
The family was scheduled to return to the USA on a flight to St. Louis on March 21 and attend the Southwest Community College basketball game in Danville, Illinois on Thursday.
A post mortem has now revealed the tragic family died of "asphyxiation by inhalation of toxic gases", ABC reports.
Sharp first got involved in the speedway through his beer distribution business, and eventually became a board member, track announcer Bob Harris said.
"Everything they did, they did as a family", Harris said. "Here in Iowa racing is a big family; we try to promote it as a family sport and (the Sharps) lived it". Sharp messaged back, saying the plans for the project looked great, and that he was traveling to Mexico.
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