Kerry Cahill is an American actress. She had her career beginnings in the 2000s where she debuted in the TV film The Staircase Murders. In the 2010s, she landed more roles in the movies, including Welcome to the Rileys, Spots, Sister Mary, and Texas Killing Fields. On television, her first notable role was as Detective Kate Cafferty in the TV series Common Law. She went on to appear in the films Snitch, Hours, Now You See Me, Oldboy, and Mississippi Grind. She went on to land roles in a variety of other projects, which include Terminator Genisys, The Runner, The Duel, and Mudbound. Between 2016 and 2020, she became known for her role as Dianne in The Walking Dead.