Girlfriend of murder suspect arrested for lying to police about her whereabouts on the night that her boyfriend 'strangled a college student to death during kinky threesome'

University of New Hampshire student Elizabeth 'Lizzi' Marriott may have been killed during a group sexual encounter



19-year-old has been declared dead and Seth Mazzaglia, 29, has been charged with her murder

Police just arrested Mazzaglia's girlfriend Kathryn McDonough



McDonough and Marriott supposedly friends from their time working at Target together years before the murder



The girlfriend of a suspect in a New Hampshire murder case has been arrested for lying to police about her whereabouts on the night when the missing college student was last seen.

Elizabeth 'Lizzie' Marriott went missing on October 9 and may have been involved in a kinky threesome with Seth Mazzaglia and his girlfriend Kathryn McDonough.

Mazzaglia, an aspiring 29-year-old actor, remains in police custody and is charged with the second dregree murder of 19-year-old Marriott even though her body has never been found.

Charged: Kathryn McDonough, 19, seen at her arraignment (left) and arrest (right) was charged with lying to the police about her whereabouts on the night that a supposed friend went missing

Support: McDonough's parents watched in court as their daughter's bail was set for $35,000

McDonough, also 19, was dating Mazzaglia at the time and investigators believe that she is the connection between the seemingly wholesome Marriott and Mazzaglia who is thought to be a member of various online dating and bondage websites.

Marriott was a student at the University of New Hampshire, and her friends said that on the day that she disappeared, she had told them that she was going to visit a friend in a town called Dover.

McDonough- who lived in an apartment with Mazzaglia in Dover- and Marriott previously worked together at Target and became friends there.

Marriott's aunt said Lizzi loved marine biology, volunteered at the New England Aquarium in Boston and enjoyed reading the Harry Potter series and The Lord of the Rings trilogy with her younger brother.

University of New Hampshire student Elizabeth 'Lizzi' Marriott vanished on her way to visit a friend on Tuesday - police now believe she is dead and have called off the search



Hunt: New Hampshire Associate Attorney General Jane Young holds a 'missing' flyer of Lizzi on Friday

McDonough was arrested on Christmas Eve for hindering apprehension or prosecution and conspiracy to commit hindering apprehension or prosecution, both of which are felony charges.

The Union Leader reports that McDonough was arrested- which comes two months after Mazzaglia was arrested for suffocating Marriot- because she lied about where she was on October 9 and 12. Her bail has been set at $35,000.

Marriott's body has not been recovered so far. Divers equipped with sonar and underwater cameras have been scouring the ocean for the teen.

'We truly believe she’s in the ocean, and we're just waiting for her to come back to shore,' said Dawn Downey of Westboro, a family friend.

Though the search was briefly called off, authorities have no focused their efforts on the waters around Peirce Island in nearby Portsmouth using both sonar technology to scan the bottom of the lake and cadaver dogs to try to pick up her scent.

Authorities in Maine and Massachusetts have also been asked to watch their shorelines in case Marriott's body washes up.

Seth Mazzaglia (left and right) of Dover, who is a struggling actor has been arrested and charged with the murder of missing student Lizzi Marriott

But that was the last activity on her phone and her bank accounts have not been accessed since.

The suspect, Seth J. Mazzaglia is listed as living at apartment 341 in the complex of 1 Mill Street in Dover.

His website indicates that he is an 'experienced actor, writer and fight choreographer' who stands 5 feet 9 inches tall and weighs 220 pounds.

He claims that his 'special skills and talents' include a third degree black belt in Okinawan karate and that he is proficient with a samurai sword, butterfly swords and other hand held weapons.

Robert Modee, who is a Kittery, Maine, martial arts instructor, confirmed that Mazzaglia is an expert in karate and that he trained with the suspect for almost 20-years.

'He's been with me, training with me, since he was probably 10 or 12 years old,' Modee said.

As well as his expertise in hand-to-hand combat, Mazzaglia claimed to have performed in 17 theater productions between 2000 and 2010.

In 2005, Mazzaglia played the role of Richie Valens in a July performance of The Buddy Holly Story, at Seacoast Repertory Theater.

One former cast member, Brett Wulfson said she remembered Mazzaglia as a pleasant man, 'very involved with self-defense'.

Silent: Seth Mazzaglia, bottom center, is seen during his video arraignment from the Strafford County jail in Dover, N.H. to the district court in Dover for the murder of Elizabeth 'Lizzi' Marriott

Mystery: A Portsmouth fire boat searches the Piscataqua River in New Hampshire for the body of student Elizabeth 'Lizzi' Marriott. No body was ever found Strangled: Lizzi's body has still not been found but police have called off the search. They will not say what led to her arrest but simply it was due to evidence collected

