Heather Laurie Holden 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 now as Andrea on The Walking Dead.

The stepdaughter of veteran film director Michael Anderson, Holden traveled the world with her family growing up on various locations and got her first break as Rock Hudson's daughter in Ray Bradbury's The Martian Chronicles (1980). Holden was raised in Canada, spent her freshman year at McGill University, then transferred to UCLA to do a BA in Theatre Arts. She is a member of the National Honor Society and was the recipient of the prestigious Natalie Wood Acting Award. 

Holden has starred in numerous television and film projects and has received worldwide critical acclaim and honorable recognition for her diverse and eclectic choice of roles.

Early in her career, Holden made a name for herself by costarring opposite Vanessa Redgrave in the TNT miniseries Young Catherine. Later, she also found some success on the small screen, playing a memorable recurring role on the seminal sci-fi series The X-Files, that of Marita Covarrubias, a mysterious government worker who becomes an informant to Special Agent Fox Mulder starting in the fourth season of that show through the final one (1996-2002). She also had a supporting role, as Mary Travis, opposite Michael Biehn and Ron Perlman in the remake of the MGM classic The Magnificent Seven (1998-2000) for CBS.