Actor Gene Hackman, 95, and his wife, Betsy Arakawa, 65, both tested negative for carbon monoxide, authorities revealed Friday, amid an investigation after they were mysteriously found dead alongside one of their dogs at their home in Santa Fe,

Santa Fe County Sheriff Adan Mendoza told NBC's “Today” show that investigators were trying to sort out conflicting stories about the doors. He said several doors were unlocked and a rear door was open, which allowed two dogs that survived to go in and out. He also said he thinks the front door was closed but unlocked.

In addition to the couple’s dead dog, which was found in a bathroom closet, two healthy dogs were located on the property. Here's a full breakdown of all of the new information.