Seth Mazzaglia, 29, of Dover, is accused of second degree murder in connection with the disappearance and presumed death of Elizabeth "Lizzi" Marriott (pictured here), a marine biology major at the University of New Hampshire. She was last heard from on Oct. 9, 2012. Marriott's family said she met Mazzaglia when both were working at a Target store. Police declined to say what led to Mazzaglia's arrest, but said they have credible information leading them to believe Marriott is dead. Maaaglia's alleged girlfriend, 19-year-old Kathryn McDonough, was also arrested on Dec. 24, 2012 in connection with Marriott's death.

This undated family photo shows Elizabeth Marriott.

This photo provided by the Dover (N.H.) Police Dept. shows murder suspect Seth Mazzaglia. He is due in court on Monday, October 15, 2012.

Robert Marriott, father of Elizabeth Marriott, is consoled by former co-worker, Paul Campaniello of Shrewsbury, as hundreds of friends and family members attended a candlelight vigil on Saturday night, Oct. 13, 2012, at the Bay State Commons.

A young woman cries during the candlelight vigil on Saturday night, Oct. 13, 2012, at the Bay State Commons, for Elizabeth Marriott.

New Hampshire Associate Attorney General Jane Young holds a flyer of missing University of New Hampshire student Elizabeth Marriott outside the police station Friday, Oct. 12, 2012 in Chester, N.H.

New Hampshire Assistant Attorney General James Vara, center, gives a news conference in Dover, N.H. on Saturday, Oct. 13, 2012. Vara announced that University of New Hampshire student, Elizabeth Marriott who disappeared earlier in the week, is dead, and a man has been charged with second-degree murder.

Locals walk their dog on Marcy Street passing a roped off area where officials search for a body on Peirce Island in Portsmouth, N.H., Saturday, Oct. 13, 2012.

Officials search for a body on Peirce Island in Portsmouth, N.H., Saturday, Oct. 13, 2012.