Born Linda Denise Blair in St. Louis, MO, she was raised in the town of Westport, CT by her parents, James Blair, a job placement executive, and Elinore, a real estate agent. Pretty and precocious from a young age, Blair began modeling at the age of six, although her earliest ambition was to become a veterinarian. She made her television acting debut three years later on the exceptionally short-lived daytime soap opera "Hidden Faces" (NBC, 1968-69), prior to her first feature film appearance as the daughter of a man experiencing a mid-life crisis in the drama "The Way We Live Now" (1969). Blair picked up another small role in the misogynistic dark comedy "The Sporting Club" (1970) before landing her breakout role in a film that would not only forever mark her professional career, but the horror film genre as well. At the tender age of 13, Blair beat out nearly 600 aspiring child actors to play the role of Regan, a young girl possessed by a demon in the film adaptation of William Peter Blatty's "The Exorcist" (1973). Directed by William Friedkin, the film starred Ellen Burstyn as a mother driven to enlist the aid of two priests (Jason Miller and Max Von Sydow) after science and medicine fail to cure her daughter's inexplicable and terrifying condition. Audiences were shocked at scenes in which Blair's head spun completely around on her shoulders and she vomited in the faces of the stunned priests, to say nothing of masturbating with a crucifix. A massive success at the box office and nominated for 10 Academy Awards, "The Exorcist" went on to become a cultural phenomenon.Among the Oscar nods for "The Exorcist" was one for Best Supporting Actress for its young star. Although she did not win, she would take home a Golden Globe in the same category, causing her future film career to look bright indeed. She returned to television for another risqué performance in the cautionary tale of juvenile delinquency, " Innocent" (NBC). A morality play with a decidedly exploitative tone, the movie was highly controversial due to an explicit scene in which Blair's 14-year-old character is raped with the handle of a toilet plunger. It was also the highest rated TV movie of the year. Almost as eyebrow-raising as her choice of roles where some of Blair's personal choices, including the dating of pop star Rick Springfield, a beau many years her senior who lived with Blair at her parents' home for a period in the mid-1970s. Back on the big screen, she was one of many frantic faces in the cast of the star-studded disaster movie "Airport 1975" (1974), before tackling the title role in "Sarah T. - Portrait of a Teenage Alcoholic" (NBC, 1975), directed by Richard Donner and featuring Mark Hamill in a pre-Luke Skywalker role. While the projects, by and large, were favorably received - at least by the viewing public - it did seem that controversial "young girl in trouble" roles were becoming a trend for the actress who was becoming increasingly troubled off screen as well.As if to prove the point, Blair followed by playing Martin Sheen's kidnapping victim in "Sweet Hostage" (ABC, 1975), and an Israeli girl held hostage with her father (Kirk Douglas) in the fact-based TV movie "Victory at Entebbe" (ABC, 1976). Drawn back by the lure of commerce and a larger role, she reprised the character of Regan MacNeil alongside respected British thespian Richard Burton in the inevitable sequel "Exorcist II: The Heretic" (1977). Directed by John Boorman - who had turned down an offer to direct the original - the film, which found Regan still pestered by demons four years later, was a massive disappointment, both critically and commercially. Despite any misgivings she may have had, Blair revisited familiar terrain as the victim of a cousin's witchcraft in director Wes Craven's early television effort "Stranger in Our House" (NBC, 1978). Even as her roles garnered less interest, Blair's personal life generated some unwanted press when she was arrested in Florida on charges of cocaine trafficking. Although felony charges were dropped, she pled guilty to lesser charges and was sentenced to probation. Combined with the rumors of her tenuous grip on her sanity after her work in "The Exorcist" and the recent downward trajectory of her career, the embarrassing incident only worsened Blair's already problematic public image.As the 1970s came to an end, Blair's career slide shifted into overdrive with films like the roller skating bomb "Roller Boogie" (1979) and the subpar haunted house movie "Hell Night" (1981). Offered increasingly exploitative material, Blair agreed to star in the women-in-prison potboiler "Chained Heat" (1983), co-starring B-movie vixens Sybil Danning and Tamara Dobson. In later years, the actress would cite this as one of the more regrettable project choices of her career, although fans of that particular sexploitation genre would hail it as a veritable masterpiece of sleaze. Amidst spotty rumors of a romantic relationship with funk music wild man Rick James in the mid-1980s, Blair's work in low-budget movies and direct-to-video projects continued to produce less than stellar results. Prime examples included "Savage Streets" (1984), in which she starred as an L.A. girl-turned vigilante after the brutal rape of her mute younger sister, followed by the even more onerous "Savage Island" (1985) - an embarrassing mess cobbled together from two previously released Italian productions with new footage of Blair incongruously added throughout.Deciding that if she was going to be relegated to lowbrow genre fare, she might as well get a piece of the action, Blair earned her first associate producer's credit on the horror feature "Grotesque" (1988). She took part in the moderately ambitious comedy "Up Your Alley" (1989), and later teamed for the first time with sexploitation director Chuck Vincent in "Bad Blood" (1989), an erotic melodrama featuring porn veterans Georgina Spelvin and Randy Spears, in addition to former teen idol Troy Donahue. She reteamed with Vincent for more T&A work in "Bedroom Eyes II" (1989), where she met B-movie regular Wings Hauser, who she later dated for several years. Blair had a bit of fun at her own expense when she spoofed her best-known role in "Repossessed" (1990), opposite funnyman Leslie Nielsen as a bumbling exorcist. Later, she appeared in and co-produced "Skins" (1994) along with then-boyfriend Hauser, who directed, co-wrote, and also produced the low-budget action yarn about neo-Nazi punks terrorizing a city neighborhood. She surfaced in a brief cameo as an obnoxious reporter in Craven's hit slasher satire "Scream" (1996) and made her Broadway debut the following year, replacing Lucy Lawless in the role of Rizzo for a 1997 revival of "Grease."Over the years, Blair had picked up her fair share of television series guest work, including a recurring role on the pop music/girl power comedy series "S Club 7 in L.A." (ABC Family, 2000). And sticking with a subject she knew all too well, she hosted the supernatural reality series "Scariest Places on Earth" (ABC Family, 2000-06). Other roles included a turn as a police detective in a 2006 episode of the popular horror-adventure series "Supernatural" (The WB, 2005-06/The CW, 2006-). Although she continued to work frequently in films and television, acting had long since taken a back seat to Blair's true passion - the rescue and care of abandoned animals throughout the Los Angeles area. It was in service of this mission that the actress created the Linda Blair WorldHeart Foundation.