By Lynne Tuohy, Associated Press

CONCORD, N.H. (AP) — A woman who New Hampshire prosecutors charged with lying to investigators about the disappearance of a University of New Hampshire sophomore last fall is expected to plead guilty.

Her lawyer says 19-year-old Kathryn McDonough of Portsmouth will plead guilty Thursday to hindering the prosecution, conspiracy and tampering with a witness. He said he expects her to be taken into custody at the conclusion of her court hearing.

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McDonough’s ex-boyfriend — Seth Mazzaglia is charged with strangling 19-year-old Elizabeth “Lizzi” Marriott last October. The couple admitted to investigators that they dumped her body into the waters off Peirce Island in Portsmouth. It has never been recovered.

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Marriott’s family members are expected to make statements during the hearing. Her father, Robert Marriott, did not return a phone call seeking comment.

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Copyright 2013 The Associated Press.