Detective Rollins marries in S.V.U.'s last episode.

Detective Amanda Rollins states, "I'm leaving S.V.U." in a new promo. Kelli Giddish will leave the N.B.C. drama on Dec. 8 after 12 seasons, and a new commercial teases her final episode.

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The teaser begins with Rollins' first conversation with Captain Olivia Benson in 2011's season 13 opener. Rollins has trouble informing her friend she's leaving after years of working together.

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Dominick "Sonny" Carisi Jr. (Peter Scanavino) asks, "Have you spoken to Olivia?" She declines.

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Rollins' marriage surprises Benson and the rest of the S.V.U. Cast more than her departure. The teaser depicts the investigator, who is likely marrying Carisi, in a wedding dress in court.

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Sergeant Odafin "Fin" Tutuola (Ice-T) asks Benson, "You going to start sobbing already, Liv?" The preview concludes with Benson and Rollins hugging.

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Giddish said her stint on S.V.U. was "one of the great pleasures and privileges of my life."

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"There's no T.V. character like Rollins," she wrote. "I've changed alongside her. I started on this program in my late 20s and am grateful to have spent so many years with Rollins."

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N.B.C.'s Law & Order: S.V.U. returns Dec. 8 at 9 p.m.

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