Oscar-winner Gene Hackman, his wife and their dog had been dead for some time and the couple’s bodies were in different rooms when deputies found them while conducting a wellness check at their Santa Fe home, authorities wrote in a search warrant.

Hackman was found dead Wednesday in a mudroom and his wife, Betsy Arakawa, was found dead in a bathroom next to a space heater. There was an open prescription bottle and pills scattered on the counter top near Arakawa.

Authorities say foul play isn’t suspected, but they haven’t disclosed how the couple died and said an investigation was ongoing.

The gas company is assisting with the probe in a sign that authorities could suspect carbon monoxide poisoning is to blame.

The New Mexico Gas Co. is working with the Santa Fe County Sheriff’s Department in the investigation, spokesperson Tim Korte told The Associated Press.

Chris Ramirez, spokesperson for the University of New Mexico Health Sciences Center, which runs the state’s medical examiner operations, declined to comment on whether any conclusions had been reached on the cause and manner of deaths of Hackman and Arakawa.

Their Southwestern-style ranch on Old Sunset Trail sits on a hill in a gated community with views of the Rocky Mountains.

The 2,300 square-foot home on one acre (0.4 hectares) was built in 2000 and had an estimated market value of a little over $1 million, according to Santa Fe County property tax records. It is modest compared to the sprawling estate next door, which was valued at $7.9 million.