What horror film, typically involving a violent psychopath stalking and murdering several people, was Caitlin Gerard in? 
Smiley (2012 film):  The film stars were Caitlin Gerard, Melanie Papalia, Keith David, Shane Dawson, Andrew James Allen, Toby Turner, and Liza Weil. Slasher film: Slasher films are a subgenre of horror films, typically involving a violent psychopath stalking and murdering several people, usually with bladed tools.
i don't know