Girlfriend of suspected murderer indicted in Lizzi Marriott case

Kathryn "Kat" McDonough indicted on three charges

By Corinne Holroyd
On April 10, 2013

  • Kathryn McDonough


A woman charged in connection with the disappearance and death of UNH student Elizabeth "Lizzi" Marriott, 19, in October of last year has been accused of another charge in the case.

Kathryn "Kat" McDonough, 19, of Portsmouth, was indicted with a new charge of witness tampering in addition to her other felony charges of hindering apprehension or prosecution and conspiracy to commit hindering apprehension or prosecution. She was indicted of all three charges by a grand jury on April 3 in Rockingham Superior Court. 

According to multiple news outlets, McDonough is Seth Mazzaglia's girlfriend. Mazzaglia, 30, is accused of strangling or suffocating Marriott and is charged with second-degree murder.

The new indictment document released by the court accuses McDonough of trying to persuade a woman named Roberta Gerkin to lie to the police on Nov. 7, 2012.

"McDonough advised Roberta Gerkin to inform officials... Gerkin did not enter the Dover apartment resided in by McDonough and Seth Mazzaglia," said the indictment.

McDonough's previous charges - hindering and conspiracy to commit hindering apprehension or prosecution - allege that McDonough worked with Mazzaglia to try to deceive investigators.

The indictment continued to say that "Katherine McDonough purposefully gave a false alibi to investigators" for both herself and Mazzaglia, knowing he was likely to be charged with murder.

Mazzaglia is also accused of giving a false alibi to investigators.

Marriott went missing on Oct. 9, 2012, after leaving a night class at UNH. Mazzaglia was arrested on Oct. 13 and charged with her murder. On Dec. 24, McDonough was arrested in connection with the case. Marriott's body has not been found despite search efforts.

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