New Hampshire Woman Involved in Lizzi Marriott Killing Freed From Prison | NECN
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New Hampshire Woman Involved in Lizzi Marriott Killing Freed From Prison

Kathryn "Kat" McDonough was released after a 3-year sentence

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    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 the woman.

    Kathryn "Kat" McDonough was released from the women's prison in Goffstown at 12:05 a.m. Saturday, said corrections spokesman Jeff Lyons.

    The 22-year-old pleaded guilty in 2013 to lying about the disappearance and death of 19-year-old Elizabeth "Lizzi" Marriott, of Westborough, Massachusetts. She testified against Seth Mazzaglia, describing their sexual relationship marked by bondage and sadomasochism. He was convicted of murder, and is serving a sentence of life without parole.

    Marriott was killed only weeks after beginning her sophomore year as a marine biology major at the University of New Hampshire in Durham. She had worked with McDonough at a department store. Her body has not been recovered.

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

    "You had the chance to do the right thing - to try to help, to do something heroic," Marriott's father, Bob Marriott, said at McDonough's sentencing. "Your failure in that moment is why Lizzi is not here to live out her life."

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