User blog comment:Masterpwn/Dragon stalker/@comment-4057437-20120621035903

One of us has a High Elf that has a dead Blood Dragon fall from the sky almost every time he goes to the Merchant District of Whiterun. He has never killed a dragon inside Whiterun. It just lays there on its back, sometimes twitching, in the middle of the road. The NPCs and ignore it, often walking right through it, which the Dragonborn can, too. It never turns into a skeleton, either.

We also had an instance where one of us badly injured a dragon that was later killed by a troll. When the Dragonborn found it some time later, it caught fire and released its soul, just as if it had just been killed.