LOS ANGELES, April 7 (UPI) -- Melissa Roxburgh says the serial killer at the center of the season finale of The Hunting Party , airing Monday at 10 p.m. EDT on NBC, disturbed her on multiple levels. Roxburgh, 32, plays Bex Henderson, an FBI profiler helping to re-capture serial killers who escaped from a top secret underground prison, The Pit. Monday's episode features Eliza Coupe as Jenna Wells, a chemist who poisons her victims. Advertisement Jenna also assumes her victims' identities to get