Elizabeth Marriott Update: Seth Mazzaglia, suspect in death of missing University of New Hampshire student, due in court

(CBS/AP) DOVER, N.H. - Seth Mazzaglia, the suspect charged in the killing of 19-year-old University of New Hampshire student Elizabeth "Lizzi" Marriott, is due to make his first court appearance.

PICTURES: University of New Hampshire student missing

Twenty-nine-year-old Mazzaglia, of Dover, is due to be arraigned Monday on second degree murder charges in connection with the Westborough, Mass. woman's death.

Meanwhile, officials expect to decide Monday the next step in the search for Marriott's body.

Marriott, a marine biology major, was last heard from on Tuesday. Her cellphone was last used that night and her car was found at UNH.

Marriott's family says she met Mazzaglia last summer when both were working at a Target store.

Police declined to say what led to Mazzaglia's arrest. They said they have credible information leading them to believe Marriott's dead, but wouldn't elaborate.