​From Wikipedia, the free encyclopedia. Heather Laurie Holden (born December 17, 1972) is an American-Canadian actress and human rights activist. She is perhaps best known for her roles as Marita Covarrubias on The X-Files, Adele Stanton on The Majestic, Cybil Bennett on Silent Hill, Amanda Dumfries on The Mist, Olivia Murray on The Shield, and Andrea on The Walking Dead. Description above from the Wikipedia article Laurie Holden , licensed under CC-BY-SA, full list of contributors on Wikipedia.