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Indictment alleges accused killer Mazzaglia suggested his girlfriend commit suicide

November 19. 2013 10:43PM
New indictments have been handed up against Seth Mazzaglia, 31, charged in the murder of University of New Hampshire sophomore Elizabeth “Lizzi” Marriott. (UNION LEADER FILE)

DOVER — Seth Mazzaglia, 31, charged in the murder of University of New Hampshire sophomore Elizabeth "Lizzi" Marriott, is facing another round of charges.

A new indictment for conspiracy to commit tampering with witnesses or informants alleges that through letters, Mazzaglia suggested girlfriend and accomplice Kathryn "Kat" McDonough should commit suicide, and he laid out how she should go about it.

The indictment is one of three handed up this week against Mazzaglia by a grand jury in connection with the murder of Marriott, 19, last October.

A second indictment alleges Mazzaglia solicited the help of someone outside the jail to help him break out in an "armed and violent" escape after his arrest for Marriott's murder, and that he gave the friend access to his bank accounts in order to finance a means by which to plan the escape, and provided the friend with detailed plans and directives about the escape.

Mazzaglia is already facing first- and second-degree murder charges alleging different theories of the crime. He is accused of strangling and/or suffocating Marriott on Oct. 9, 2012, before, during and after committing aggravated felonious sexual assault.

In the letters, which McDonough allegedly destroyed, he also laid out a detailed alibi that his girlfriend "Kat" McDonough was to commit to memory and suggested they get married, believing McDonough would then not have to testify against him. The indictment alleges Mazzaglia also suggested framing two friends who were allegedly in Mazzaglia's Mill Street apartment after Marriott's murder.

The last new indictment, for falsifying physical evidence, repeats many known details about Mazzaglia and McDonough's actions after Marriott's murder, while adding that police believe they put Marriott in a suitcase wrapped in a tarp to remove her from the apartment. Police believe the couple then loaded the suitcase into Marriott's vehicle and drove it to Peirce Island in Portsmouth where they allegedly dumped her body into the Piscataqua River estuary. They later abandoned Marriott's car in a UNH parking lot.

Marriott's body has never been recovered.

McDonough is serving a 1½- to three-year sentence on charges of hindering prosecution as part of a negotiated plea deal she reached with the state in July. McDonough is also expected to testify against Mazzaglia as part of the deal.

Jury selection in the trial against Mazzaglia is tentatively scheduled to begin in May 2014.

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