Connecticut Police Sgt. Kevin O'Donnell told The Cheshire Citizen that Mitchell was a known "hoarder" and "recluse," who had long refused help from police and social services.
"This was an accidental death caused by disrepair," he said.
A postal worker first contacted authorities when he noticed that no one had been collecting mail for the home for more than a week.
In a similar incident last March, a Texas man was found dead behind a "10-foot wall of trash." Rescue crews spent two days trying to recover his body.