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Home » News » Crime

July 25. 2013 4:47PM

Portsmouth woman pleads guilty to hindering murder probe, will testify against boyfriend

BRENTWOOD – Kathryn McDonough began serving a 1 ½- to 3- year prison term Thursday as part of a negotiated plea deal that turned her into a key state witness at her boyfriend's upcoming first-degree murder trial.

McDonough, 19, of Portsmouth, pleaded guilty Thursday to charges that she blocked efforts of state and local police to find out who killed Elizabeth "Lizzi" Marriott, a University of New Hampshire sophomore who went missing on Oct. 9.
Seth Mazzaglia, 30, of Dover is facing charges of first- and second-degree murder, felonious sexual assault and hindering apprehension in Strafford County. State prosecutors said they've proposed a May trial date for Mazzaglia.

McDonough's plea deal outraged Marriott's family members who said that New Hampshire should have stronger laws on its books to punish those who aid in murders after the fact.

"Accessory to murder would be much more fitting as it relates to Kathryn McDonough to the death of my daughter and does not suggest some victimless crime," Bob Marriott, the victim's father, said Wednesday.

He was among roughly a dozen family members who attended McDonough's plea-and-sentencing hearing in Rockingham County Superior Court.

McDonough received 3 ½- to 7-year sentences on three charges - hindering apprehension, conspiracy to commit hindering apprehension and witness tampering - but she received a reduced sentence for her expected cooperation in Mazzaglia's upcoming trial.

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