Actor Gene Hackman died of heart disease a full week after his wife died from hantavirus in their New Mexico hillside home, and he may not have been aware she was dead because he showed severe signs of Alzheimer’s disease, authorities revealed Friday. Both deaths were ruled to be from natural causes, chief medical examiner Dr. Heather Jarrell said alongside state fire and health officials at a news conference. Authorities ruled out foul play after the bodies of Hackman, 95, and Betsy Arakawa, 65, were discovered Feb 26. Immediate tests for carbon monoxide poisoning were negative. Investigators found that the last known communication and activity from Arakawa was Feb. 11 when she visited a pharmacy, a pet store and a farm market, Santa Fe County Sheriff Adan Mendoza said Friday. Hackman's pacemaker last showed signs of activity a week later and that he had an abnormal heart rhythm Feb. 18., the day he likely died, Jarrell said. More local videos here: https://youtube.com/@9news Subscribe to NEXT: https://youtube.com/@Nexton9NEWS Stay connected: 9NEWS Website: https://www.9news.com/ Facebook: https://www.facebook.com/ilike9news X: https://twitter.com/9NEWS Instagram: https://www.instagram.com/9newsdenver/ Download the 9NEWS App: https://www.9news.com/appredirect/ Sign up for the 9NEWSLETTER: https://www.9news.com/email 9NEWS (KUSA) is located in Denver, Colorado.