Heather Laurie Holden (born December 17, 1969) is an American-Canadian actress, producer, model, and human rights activist. She is best known for her portrayals as Marita Covarrubias in The X-Files (1996–2002), Andrea Harrison in AMC's The Walking Dead (2010–2013, 2020–2022), and Amanda Dumfries in The Mist (2007).