Katherine Cassidy is an American actress who starred as Laurel Lance on The CW’s television franchise Arrowverse (including Arrow, The Flash & Legends of Tomorrow) starting since 2012. She has also appeared on the CW shows Supernatural, Melrose Place, and Gossip Girl; on the CBS miniseries Harper’s Island; and in the films Click (2006), Taken (2008), Monte Carlo (2011), and The Scribbler (2014). Cassidy has gained a reputation as a “scream queen” due to her numerous roles in horror films (most of which are remakes of classics of the genre) which include her feature film debut When a Stranger Calls (2006), The Lost (2006), Black Christmas (2006), and A Nightmare on Elm Street (2010).
In 2003, Cassidy made her television and acting debut appearing in an episode of the Lifetime drama series The Division. Cassidy has continued to guest appear in television shows such as Celebrity Apprentice 4, Listen Up! and New Girl. In 2005, Cassidy appeared in a recurring role on The WB’s series 7th Heaven over the course of four episodes.
In 2006, Cassidy made her film debut in the horror film When a Stranger Calls. Cassidy has gone on to have notable supporting roles in films Click and Taken. In February 2006, Cassidy was cast as Kelli Presley in the Dimension Films horror-slasher film Black Christmas, a remake of the 1974 film. In April 2010, Cassidy appeared in another remake; this time the horror classic A Nightmare on Elm Street.
In 2007, Cassidy appeared on The CW’s supernatural drama series Supernatural. Cassidy played the role of Ruby, a demon. Making her debut in the show’s third season, Cassidy appeared in over six episodes. In February 2009, The CW cast Cassidy as a lead in the drama series Melrose Place, a reboot of the 1990s series of the same name. In June 2010, The CW announced Cassidy was cast in the teen drama series Gossip Girl as Juliet Sharp, who attends Columbia University and sets out to ruin the life of the show’s central character Serena.
In February 2012, Cassidy landed the lead role of Laurel Lance/Black Canary in The CW’s series Arrow, which is based on the Green Arrow comic books. Cassidy left the show in the fourth season. On May 17, 2016, she guest-starred in the second season of the spin-off series The Flash as the metahuman Black Siren, Lance’s Earth-2 doppelgänger.