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Katherine Evelyn Anita Cassidy (born November 25, 1986) is an American actress. Following several minor television roles, she came to attention as a Scream Queen after starring in the horror films When a Stranger Calls (2006) and Black Christmas (2006) and as Ruby in the third season of the horror series Supernatural (2007–08). Following a supporting role in the action film Taken (2008) and played leading roles in the mystery horror series Harper's Island (2009) and the drama series Melrose Place (2009–10). Cassidy starred as Kris Fowles in the slasher film A Nightmare on Elm Street (2010) and had a recurring role as Juliet Sharp during the fourth season of the teen drama Gossip Girl (2010
Cassidy had her breakthrough in 2012, after being cast as Laurel Lance / Black Canary, one of the main characters on The CW television series Arrow, which spawned an entire franchise known as the Arrowverse. Cassidy reprised her role in The Flash and Legends of Tomorrow as well as voicing the character in the animated web series Vixen. In 2017, Cassidy began playing Black Siren, an antagonistic version of the character from a parallel universe, originating on The Flash and continuing on to Arrow.