Gene Hackman and his wife, Betsy Arakawa, tested negative for carbon monoxide poisoning, but authorities are still investigating their deaths at their Santa Fe home. Hackman, 95, likely died on Feb. 17, the last day his pacemaker recorded activity, while Arakawa, 65, was found in a bathroom near a space heater and scattered pills. Hackman was discovered in a mudroom with a walking cane and sunglasses nearby.

Gene Hackman and his wife, Betsy Arakawa, attending the 2003 Golden Globe Awards in Los Angeles.

Authorities, who found no gas leaks or signs of foul play, are investigating whether a sudden fall or medical emergency occurred. A German Shepherd was also found dead in the home, while two other dogs survived. The discovery was made after a maintenance worker and neighborhood security saw the couple unresponsive through a window.

Initial autopsies showed no external trauma. Investigators collected medications, including thyroid and blood pressure prescriptions, as part of the ongoing inquiry. Toxicology reports, which could take months, will be crucial in determining the cause of death.

Hackman, an Oscar-winning actor known for The French Connection, The Conversation, and Unforgiven, retired from acting in 2004 after starring in Welcome to Mooseport.