Actor Gene Hackman, his wife Betsy Arakawa, and their dog were found dead in their Santa Fe home, in a scene that one detective had deemed “suspicious enough in nature to require a thorough search and investigation.

Authorities investigating the deaths of Oscar-winner Gene Hackman and his wife are waiting for the results of the autopsies, and carbon monoxide and toxicology testing to determine how they died.

Gene Hackman, his wife Betsy Arakawa and their dog were found dead in their home on Feb. 26, the Santa Fe County Sheriff’s office tells PEOPLE