I talked to a friend who lives a couple of blocks away and she'd never heard about it either. Very strange.
Weird! My gut feeling is that maybe there was no foul play suspected, just someone dying in their home - with the complication that the tenancy records were incomplete or incorrect. The John Doe could have been living under an assumed name, or maybe even just using a fake name to cover for bad credit or something.
Anyone else think the medial scar could be a vein harvested for possible heart surgery? I wonder if there is some hold back going on here....they should have been able to see if his chest was operated on. It would make sense given his probable age. Some physician somewhere would certainly remember those tats.