Jessica Biel on ‘Sinner’: It’s not a whodunit, it’s a why-did-she-do-it

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Best known for “7th Heaven,” actress Jessica Biel portrays a young mother who suddenly attacks a total stranger in the miniseries “Sinner.” “We are not looking for who, we are looking for why,” Biel tells TODAY. She also talks about Silas, her 2-year-old son with singer Justin Timberlake.