Headhunter (2005)

Ambitious young go-getter Ben Caruso signs on with sexy corporate headhunter Sarah Tierney. Sarah gets Ben a new job with great pay working the graveyard shift. However, Ben soon discovers that Sarah is a witch and his coworkers are the tormented souls of Sarah's previous conquests. If Ben doesn't find a missing head in a few days, he's in danger of losing his own.