Fort Worth Fire Department officials say Robert "Bobby" Hubbard apparently succumbed to the smoke while trying to flee the Feb. 4 blaze. Police also say Hubbard suffered from dementia.
The Fort Worth Star-Telegram reported Sunday that clothing worn by Hubbard tested positive for gasoline. Matches were found on and near him when firefighters located his body.
Thomas Wheat also died.
Homicide Sgt. Cheryl Johnson says investigators found no indication that Hubbard and Wheat were having difficulties.
Authorities have found no connection between that fire and an arson blaze about an hour earlier at the nearby home of the men's caregiver.