Kathryn McDonough released after being sentenced in Elizabeth Marriott murder case
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 for her domineering boyfriend.
Kathryn 'Kat' McDonough then helped him dispose of the co-worker's body after authorities said he strangled and raped the woman.
On Saturday, McDonough was released from the women's prison in Goffstown at 12.05am, according to corrections spokesman Jeff Lyons.
The now 22-year-old had pleaded guilty in 2013 to lying about the disappearance and death of 19-year-old Elizabeth 'Lizzi' Marriott, of Westborough, Massachusetts.
Kathryn 'Kat' McDonough, 22, (picutred in 2014) is free after serving a three-year prison sentence for her role in the 2012 rape and murder of 19-year-old Elizabeth 'Lizzi' Marriott
Marriott (pictured left, and right with her parents), was strangled to death after she refused to take part in a threesome with McDonough and her boyfriend Seth Mazzaglia
She testified against her boyfriend, Seth Mazzaglia, describing their sexual relationship marked by bondage and sadomasochism.
He was convicted of murder, and is currently serving a sentence of life without parole.
Marriott, who worked with McDonough at a department store, was killed only weeks after beginning her sophomore year as a marine biology major at the University of New Hampshire in Durham.
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.
Seth Mazzaglia was convicted of murder, and is currently serving a sentence of life without parole
'Your failure in that moment is why Lizzi is not here to live out her life.'
During the trial, McDonough, who was on the stand for 10 days, testified that Mazzaglia demanded that McDonough find him a sex partner.
She said Marriott went to McDonough and Mazzaglia's home in Dover, thinking she was going to watch a movie or play a video game.
Instead, McDonough testified, Mazzaglia strangled the woman with a rope after she rebuffed his sexual advances and then raped her motionless body.
McDonough and Mazzaglia said they then used Marriott's car to transport her body and dumped it off of Portsmouth's Peirce island.
She also testified that Mazzaglia, now 33, was angry at her when she left him home for nearly two weeks without a sex partner while she attended theater camp and demanded she bring him another woman to join in their sexual escapades, which included bondage and discipline.
Mazzaglia's lawyers said McDonough was the dominatrix, a woman who made Mazzaglia her sex slave and was obsessed with finding another woman to dominate.
They said she lied and testified against him to get a more lenient sentence, however McDonough testified she was always the submissive in their relationship.
During cross-examination, McDonough began sobbing as she blurted out that she couldn't remember minor details from the night Marriott was killed.
She said the image of Mazzaglia strangling Marriott took over her mind.
When the witness was not visibly tearing up, defense attorney Joachim Barth challenged her outburst, asking 'You cry without tears, Ms. McDonough?' She did not reply.
In November 2014, McDonough was denied parole.
The parole board said she could apply again once she takes mental health classes and develops a better post-release plan that involves her living out-of-state.
McDonough pictured left and right during court in 2014 as she broke down crying after being asked how she felt after telling jurors how she pushed Marriott's body into the water and covered it with seaweed
Chairwoman Donna Sytek said, 'You got the deal of the century.'
McDonough told the board she'd had a lot of time to think about 'what a horrible, horrible thing it was. I allowed someone's life to end.'
As her release from prison neared, she planned to live with her father on the seacoast, however the parole board was concerned that she not live so close to the scene of the crimes.
Due to her notoriety, board members said, McDonough would have difficulty finding a job or even being in public near where the crime occurred.
But with the sentence served, she is under no obligation to follow the board's guidelines, and the board cannot impose any conditions on her, nor does she have to tell authorities where she will live.
McDonough declined an interview request from The Associated Press and her attorney did not respond to a message seeking comment.
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