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Mariska Hargitay, 'Law & Order: SVU'

During the beginning of "SVU's" eighth season, Detective Olivia Benson leaves to work with the FBI on a case involving an attack on an FBI agent who's infiltrated an eco-terrorist group –- allowing Mariska Hartigay to take maternity leave following the 2006 birth of her son, August (whose father, Peter Hermann, has played defense attorney Trevor Langan on the show). NBC