Gene Hackman and his wife, Betsy Arakawa, tested negative for carbon monoxide poisoning, the Santa Fe Sheriffs Department in New Mexico said Friday, one day after they were found dead with their dog.

Oscar-winning actor Gene Hackman’s pacemaker shows he probably died on Feb. 17, days before investigators found his body and that of his wife in their New Mexico home.

Santa Fe County Sheriff Adan Mendoza told NBC's “Today” show that investigators were trying to sort out conflicting stories about the doors. He said several doors were unlocked and a rear door was open, which allowed two dogs that survived to go in and out. He also said he thinks the front door was closed but unlocked.

Preliminary autopsy results didn't determine how Oscar-winner Gene Hackman and his wife died at their home in Santa Fe, New Mexico, but did rule out that they were killed by carbon monoxide poisoning,

Gene Hackman previously spoke about his decision to step away from Hollywood and live a quiet life in New Mexico alongside wife Betsy Arakawa. The Oscar winning actor was found dead at 95 on Feb. 26.

He was loved and admired by millions around the world for his brilliant acting career, but to us he was always just Dad and Grandpa,” Hackman's daughters and granddaughter said in a statement.

Oscar-winning actor Gene Hackman, his wife and their dog were found dead in their New Mexico home, authorities said Thursday.

Iconic actor and Oscar winner Gene Hackman and his wife Betsy Arakwa were found dead in their New Mexico home.