Gene Hackman died of heart disease, his wife died of hantavirus about a week prior, police say

US authorities have revealed that Gene Hackman died of heart disease while his wife died of hantavirus about one week prior.

Authorities initially ruled out foul play after the bodies were discovered Feb 26. Immediate tests for carbon monoxide poisoning were negative.

Betsy Arakawa, 65, was found with an open prescription bottle and pills scattered on the bathroom counter. Authorities linked her death to hantavirus pulmonary syndrome.

Hackman, 95, was found in the home's entryway. His death was tied to heart disease with Alzheimer's disease contributing.

Hantavirus is a rare but potentially fatal disease spread by infected rodent droppings. It is typically is reported in spring and summer, often due to exposures that occur when people are near mouse droppings in homes, sheds or poorly ventilated areas.

Santa Fe County Sheriff Adan Mendoza made the announcement alongside state fire and health officials at a news conference.

Investigators earlier retrieved personal items from the couple's home, including a monthly planner and two cellphones.