While the cause of death for Gene Hackman and his wife, Betsy Arakawa, is still unknown, investigators have ruled out possible carbon monoxide poisoning and external trauma, Santa Fe County Sheriff Adan Mendoza said in a Friday afternoon press conference.

Gene Hackman and his wife Betsy Arakawa tested negative for carbon monoxide in the initial results of the toxicology report, leading officials to rule out the gas as a cause of Hackman and Arakawa’s death, Sheriff Adan Mendoza said in a press conference on Friday.

Probe into Gene Hackman & his wife's deaths remains open with autopsy results weeks away as external trauma was removed as a possible cause.