“Pretty Girls Kill” (*1/2 out of four) was a pretty dumb grindhouse B-movie melodrama about a woman (Isabel Ann) who witnesses her friend’s murder and then 20 years later she has to confront the killers (Brooke Aura, Crystal Beharry, and others) who have returned in demonic form. Gorgeous cast help keep this watchable for at least a little while but it gradually devolves into monotonous sleaze and sludge. For anyone who stays with it, film just stops without ending but you won’t be complaining.