One painful year later; Memories of Lizzi ease the grief.

Byline: Paula J. Owen

WESTBORO -- One year after University of New Hampshire sophomore Elizabeth "Lizzi'' Marriott's death, her family still grieves and tries to come to terms with the fact they may never get to say goodbye to their only daughter.

Ms. Marriott, 19, was allegedly strangled to death by Seth Mazzaglia Oct. 9 while his girlfriend Kathryn "Kat'' McDonough, whom Ms. Marriott worked with, befriended and trusted, stood by and did nothing to try to save her, according to prosecutors.

Ms. Marriott's body, allegedly dumped off the coast of Peirce Island in Portsmouth, N.H., has never been recovered despite months of extensive searching.

During Ms. McDonough's sentencing hearing a few months ago, Ms. Marriott's father, Robert Marriott, read an emotional and powerful impact statement while trying to hold back tears.

"Lizzi is gone forever and the defendant lives and will walk free in a short period of time,'' Mr. Marriott said. "Lizzi met Kat and thought she made a new friend and it got her killed. ... There are no words that can capture my grief and rage for what has happened. ... I want to say goodbye to a person when they die. That is something I'll never be able to do to my baby.''

Last month, conspiracy charges were added to the list of charges against Mr. Mazzaglia, 30, after he was indicted in Strafford County Superior Court when investigators discovered he and Ms. McDonough, 19, both of Dover, used Ms. McDonough's cellphone to create fake text messages.

Prosecutors said the duo sent the fake messages to Ms. Marriott, deleted text messages in which they planned the visit of Ms. Marriott to their apartment where police say she was killed, and gathered clothes and the rope used to kill her after her death. In addition, they used Ms. Marriott's car to move her body to Peirce Island in Portsmouth, dumped the body into the Piscataqua River, broke and threw away her cellphone and GPS, and then abandoned her car in a parking lot on the UNH campus on Oct. 9, prosecutors allege.

Later, the couple threw away a suitcase and tarp that were used to transport Ms. Marriott's body, according to prosecutors, and created a fake alibi and discussed what they should tell police about their whereabouts the night she was killed.

Prosecutors say the conspiracy continued through December, as letters were sent back and forth between Mr. Mazzaglia and Ms. McDonough, after he was arrested, to concoct stories about what happened the night of Ms. Marriott's...