Gene Hackman and his wife Betsy Arakawa tested negative for carbon monoxide in the initial results of the toxicology report, leading officials to rule out the gas as a cause of Hackman and Arakawa’s death, Sheriff Adan Mendoza said in a press conference on Friday.

The sheriff said it is "a very good assumption" Hackman had been dead at least 9 days, noting the "last event" on his pacemaker was on Feb. 17.