A man charged with killing a University of New Hampshire student in October plotted with a girlfriend to tell investigators she was strangled during a consensual sex act, prosecutors said.
Court documents released Tuesday charge 30-year-old Seth Mazzaglia of Dover with killing 19-year-old Elizabeth 'Lizzi' Marriott during an attempted sexual assault on October 9.
The indictments allege an extensive cover-up by Mazzaglia and his then-girlfriend, Kathryn McDonough, including using Marriott's car to drive her body to Peirce Island in Portsmouth and dumping it in the Piscataqua River.
Her body has never been recovered.
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
Mazzaglia is also charged with second-degree murder for showing 'extreme indifference to human life.'
A hindering prosecution charge details a series of actions the couple allegedly took to mislead police. Prosecutors say McDonough sent a text to Marriott an hour after she was killed at their Dover apartment asking why she never showed up for their planned visit.
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The indictments allege the pair also broke Marriott's cellphone and GPS tracking system and abandoned Marriott's car in a parking lot at the University of New Hampshire, where Marriott had transferred to as a sophomore to study marine biology.
Prosecutors say they also concocted the plan to say Marriott was killed accidentally during a consensual sex act - a notion that the lead prosecutor and Marriott's family Tuesday decried as false.
'There's no allegation of anything consensual,' Senior Assistant Attorney General Jeffery Strelzin said Tuesday. 'On the contrary, it was not consensual.'
Marriott's parents, Bob and Melissa Marriott of Westborough, Massachusetts, called the suggestion their daughter was killed during some bizarre consensual sex act 'reprehensible.'
University of New Hampshire student Elizabeth 'Lizzi' Marriott vanished on her way to visit a friend in October; Mazzaglia testified that she was strangled in a consensual sex act
Their lawyer, George Thompson, said the Marriotts are 'resolute in their demands for justice for Lizzi' and are satisfied with the indictments.
Mazzaglia faces two alternate theory first-degree murder charges. One alleges he strangled Marriott. The other alleges he used physical force to strangle her before, during or after an attempt to sexually assault her.
Marriott's disappearance on October 9 led to a massive search, and her family and friends distributed leaflets throughout the seacoast region seeking clues to her whereabouts. Her cellphone was last used in Dover at 10:11 p.m. that night.
On October 13, four days after Marriott was last heard from, police took Mazzaglia into custody and charged him with second-degree murder.
Kathryn McDonough, 19, is charged with lying to authorities regarding the death of Lizzie Marriot
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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
An outdoor memorial service at UNH drew hundreds of somber students, some of whom spoke of exuberance and love of life.
University President Mark Huddleston told the sea of students that even though she had been at UNH only a short time, she was very much a part of the college community.
'Losing Lizzi was losing part of ourselves,' Huddleston said.
Mazzaglia, who is being held without bond, is due in court May 2.
Attorney Joachim Barth, one of the public defenders representing Mazzaglia, on Tuesday declined to comment on the indictments.
McDonough is due to return to court Thursday for a bail hearing, but may waive that hearing. She was indicted earlier this month on charges of hindering the prosecution, conspiracy and witness tampering.
Fruitless: A Portsmouth fire boat joins the search of the Piscataqua River in New Hampshire for the body of student Elizabeth 'Lizzi' Marriott, which has since been called off
According to The Portsmouth Herald, Mazzaglia had several accounts on online dating sites, including OKCupid.com, where his user name was listed as DarKaiser.
Another account of a 29-year-old DarKaiser was found on an S&M website described as 'the world's largest largest BDSM (bondage, discipline, dominance and submission, and sadomasochism) community and the most exciting bondage and fetish Web site.'
The user by the name DarKaiser wrote in his profile that he is 'a master seeking a slave.'
On another bondage website described as a Facebook 'run by kinksters,' a 29-year-old DarKaiser from New Hampshire wrote that he was looking for 'a lifetime relationship, a relationship; a play partner' princess by day, slut by night' and a sub.'
In addition, Mazzaglia claims to have a 750 hour certification in massage therapy awarded by McIntosh College in 2007.
Marriott was a 2011 graduate of Westborough High School in Massachusetts. She lived with an aunt in Chester and commuted to the Durham campus.