The investigation into the deaths of Gene Hackman and his wife, Betsy Arakawa, continues, with initial results ruling out carbon monoxide poisoning.

An autopsy and toxicology report have been completed, but full results may take weeks or months. Investigators hope for answers sooner.

Forensic pathologist Dr. Michael Baden suggested their deaths may have been a tragic accident. Signs of mummification indicate they likely died nine days before being found. Hackman’s pacemaker last recorded activity on Feb. 17, possibly signaling cardiac arrest due to severe heart disease. Baden speculates Arakawa may have died while trying to help him.

Authorities found various medications at the scene and accessed health records and cell phones as part of the investigation.