<Li> List of Law & Order: Special Victims Unit episodes </Li> <P> "Smoked" is the twelfth season finale of the police procedural television series Law & Order: Special Victims Unit and the 272nd overall episode . It originally aired on NBC on May 18, 2011 . In the episode, Detectives Elliot Stabler (Christopher Meloni), Olivia Benson (Mariska Hargitay), and Fin Tutuola (Ice - T) investigate the murder of a rape victim who was scheduled to testify in a high - profile rape case . After the suspects are arrested, the victim's daughter opens fire in the squad room, killing several people inside before Detective Stabler fatally shoots her . </P> <P> The episode was written by Jonathan Greene and Daniel Truly and was directed by Helen Shaver . It marks the final appearance of leading costar Christopher Meloni and the last episode to feature B.D. Wong and Tamara Tunie in the opening credits, as all three actors announced their departure from the series after the end of this season (though Wong and Tunie would occasionally appear in the coming years). The episode also marks the final appearance of Charlayne Woodard, who had portrayed Sister Peg on a recurring basis since 2002; her character is caught in the crossfire during the shooting and dies after sustaining a gunshot wound to the torso . </P> <P> "Smoked" received mixed reviews from critics . According to Nielsen ratings, the episode's original broadcast was watched by 8.98 million viewers, making it the most watched program on NBC of the night and the most watched program in the 10: 00 p.m. time slot . </P>

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