Margaret Grace Denig (born September 21, 1983) is an American actress. She is known for playing Shannon Rutherford on the ABC television series Lost (2004–2006; 2010), Kim Mills in the Taken trilogy (2008–2014), Irina in The Twilight Saga (2011–2012), and Althea Szewczyk-Przygocki in Fear the Walking Dead (2018–2021).