Specific Dean/cas au fic

[lisuli]

I’m looking for a dean/cas fic that’s an au where everyone knows about the supernatural. The only detail I remember is Dean is a police officer (or some sort of law enforcement) and his previous partner was Benny. They were on an easy case but then Benny was shot and his body kept trying to heal himself since he was a vampire so Dean had to kill him. Sam is in the background trying to get Dean to cope with his loss.

Thanks!