Vivian Kerr is an American actress who played serial killer Amanda Lowery on Castle. She has guest starred on numerous television shows, including Rizzoli & Isles, New Girl, Bad Judge, Criminal Minds, Masters of Sex, American Horror Story, and Grey's Anatomy. She has appeared in IFC Midnight's horror thriller film The Den, the comedy short film The Assistant with Janeane Garofalo, and the period drama film Lines about the Bronte sisters, which she also wrote and produced.