Lost and The Lord Of The Rings: Fellowship of The Ring actor Dominic Monaghan has signed on to star in Edna McCallion's psychological thriller Pet. According to The Hollywood Reporter, this MGM project will be produced by Aaron Kaplan, Sean Perrone, Steven Schneider and Dan Katzman.

Monaghan is set to star as Seth, a man who bumps into his old high school crush and quickly becomes obsessed with her. He then takes her captive underneath the animal shelter where he works but soon suspects that his old flame is not who she seems to be.

Pet is scheduled to start filming within the next few months.