By Kathy McCormack, Associated Press

CONCORD, N.H. (AP) — A New Hampshire woman is free after serving a three-year prison sentence for luring a co-worker to her apartment in 2012 as a sex offering to her domineering boyfriend, then helping him dispose of the co-worker’s body after authorities say he strangled and raped her.

Corrections spokesman Jeff Lyons says Kathryn “Kat” McDonough was released from the Goffstown women’s prison at 12:05 a.m. Saturday.

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The 22-year-old pleaded guilty in 2013 to lying about the death of 19-year-old Elizabeth “Lizzi” Marriott, of Westborough, Massachusetts. She testified against Seth Mazzaglia, saying their sexual relationship included bondage and sadomasochism. He’s serving a sentence of life without parole.

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McDonough first told investigators that Marriott died during rough sex between them. After getting immunity from prosecution, she changed her story, saying Mazzaglia killed Marriott after she rejected him.

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