i had a similar situation in whiterun with the armor/weapon shop. it turned out i needed to advance the current quest to the next stage because everyone was just "waiting" for me in a certain location. maybe it's the same for you.
yeah, well, you know, that's just like...uhh...your opinion man
Yeah it's locked for me too. I'm guessing he/she died because of a dragon attack or something. I've fought quite a few dragons there so it wouldn't be a surprise to me.
On a related side note, the guy in Winterhold that was crying over some woman died in front of me trying to take his frustrations out on some dragon. His house is also locked but I know for a fact he's dead because his body is still laying in the road. It has been at least 2 months (real time and 200+ hours in game) and the body hasn't disappeared. Apparently the city is limited in budget leaving any clean up program a mess. I'm thinking about blasting him over the cliff and into the sea as a result.