I came out of my house in White Run and there was a Vampire attack. One of the vampires turned to ash and during the attack the woman smith from Warmaiden's was also killed. So I reloaded because I use her shop a lot. She survived however I realised that the ashed vampire was the nord salesman from inside Warmaiden's. Has this happened to anyone else where a shopkeepr was a vampire and was killed?

He was probably electrocuted

Lol that's never happened to me before, I'm in two minds about this sort of thing. On one hand I would love to see NPCs become vampires on occasion but on the other hand you would lose NPCs a lot because of it. Would be cool if NPCs respawned but then it would be difficult to have unique NPCs.

Sorry I seem to have gone off track, it's never happened to me before.

How do you know he was a vampire??

He probably died, and then his corpse was reanimated by the vampire. Then, when he died, his body becomes ash.

He most likely died during the attack, then one of the Vampire Resurrected him, then the vampire died, so he turned to ashes.