Hackman, who was dressed in gray sweatpants and a blue long-sleeved t-shirt, was found dead in the mudroom. A pair of sunglasses and a walking cane were found nearby. An officer at the scene suspected that Hackman had “suddenly fallen,” according to a search warrant affidavit obtained by PEOPLE.

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.

Autopsies found no external trauma to either individual and carbon monoxide and toxicology tests are pending, according to authorities in Santa Fe, New Mexico.