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.

Authorities are set to reveal more information about an investigation into the deaths of actor Gene Hackman and wife Betsy Arakawa, whose partially mummified bodies were discovered last month at their home in New Mexico.