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Cook's first job was in a McDonald's commercial in 1997. She had a guest role on the television series Goosebumps, and appeared in two television movies, In His Father’s Shoes and Elvis Meets Nixon. Cook made her feature film debut in 1999's The Virgin Suicides. Also that year she got a recurring in the TV series Higher Ground.

Cook starred in the 2000 TV movie The Spiral Staircase, and then appeared in several films, including Out Cold and Final Destination 2. She currently stars as Jennifer "J.J." Jareau in the CBS drama Criminal Minds.

(wikipedia.org)