CHATTANOOGA (AP) — Strange, sad and macabre, the discovery of the skeletal remains of twin brothers Andrew and Anthony Johnson has mystified neighbors and others in Chattanooga and beyond. Each man was found seated in an easy chair inside the modest home they shared for decades, and where they apparently died together about three years ago, with no obvious signs of foul play.Even while they were alive, though, the 63-year-old twins were something of a mystery to their neighbors, who occasionally saw them wearing surgical masks while gardening but never saw them with visitors.“I didn’t even know their names,” said retiree Linda Maffett, who lived across the street.In an interview about the Johnsons she added, “It’s a strange story, it’s a sad story. I think it's sad that they were sitting there that long with nobody checking on them.”Police went to the home March 29 after being asked to check on the brothers by a relative who had a key.