The investigation into the death of Gene Hackman, his wife and dog has found no signs of foul play or gunshot or other wounds, and the gas company is assisting with the probe in a sign that authorities could suspect carbon monoxide poisoning is to blame.

Both Hackman and wife test negative for carbon monoxide poisoning

Gene Hackman and his wife tested negative for carbon monoxide poisoning, but cause of death still unknown, sheriff says.

Authorities in New Mexico continue to investigate the cause of death of actor Gene Hackman and his wife​ Betsy Arakawa, but they say it does not appear to be carbon monoxide poisoning. Gene Hackman and his wife,

Investigators are treating the deaths of actor Gene Hackman, 95, and wife Betsy Arakawa, 65, as "suspicious" and are looking into possible carbon monoxide poisoning as their causes of death.

Gene Hackman and his wife Betsy Arakawa tested negative for carbon monoxide after they were found dead at their New Mexico home on Feb. 26, per police.

The New Mexico Gas Company's "extensive investigation for gas leaks and carbon monoxide at Gene Hackman's home" ruled out possible causes of death.

Gene Hackman and his wife were found dead in their New Mexico home. Social media users speculated carbon monoxide poisoning may be the cause of their deaths.