Tennessee police are investigating the strange deaths of identical twin brothers whose decomposing bodies were found sitting in recliners in their Chattanooga home over the weekend.

Neighbors told WRCB that they hadn't seen Anthony and Andrew Johnson, 63, in about two years. They told the station that they assumed the twins stayed indoors because of their health, and never suspected anything was wrong since their home's yard was kept and mail was not overflowing from their mailbox.

"I haven't seen them in over a year and a half. I thought maybe they'd been put in a nursing home," Barbara Owens, who lives a few doors down, told the station.

In August 2011, a relative reportedly came to check on the brothers but couldn't get in without a key. Police wouldn't force their way inside. Over the weekend, a relative was able to gain entry, and made the grisly discovery.

Chattanooga police estimate the date of death to be sometime in early 2011, based on the condition of the bodies and receipts found in the house. Medical examiners are working to determine an exact date and cause of death.