Actor Gene Hackman died of heart disease a full week after his wife died from hantavirus in their New Mexico home, likely unaware that she was dead because he was in the advanced stages of Alzheimer’s disease, authorities revealed Friday.

Leslie Anne Allen, Hackman’s daughter whom he shared with his late ex-wife Faye Maltese, has said of her father’s marriage to Arakawa, “They had a wonderful marriage. And I give credit to his wife, Betsy, for keeping him alive.”

The partially mummified bodies of Hackman and his wife, Betsy Arakawa, were discovered in February at their home in New Mexico.