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Defense attorney Joachim Barth,right, questions Kathryn McDonough during her former boyfriend Seth Mazzaglia's first-degree murder trail at Strafford County Superior Court, Thursday, June 5, 2014, in Dover, N.H. Mazzaglia is on trial for allegedly killing Elizabeth "Lizzi" Marriott, a University of New Hampshire student, in his Dover N.H. apartment on Oct. 9, 2012. (AP Photo, Foster's Daily Democrat, John Huff, Pool)

DOVER, N.H. (AP) — The defense lawyer for a man charged with raping and killing a University of New Hampshire student has spent his first day cross-examining the state's star witness by trying to show she was possessed by imaginary characters she had created.

Defense attorney Joachim (JAHK'-ihm) Barth also said 20-year-old Kathryn McDonough changed her story and shifted the blame from herself to her ex-boyfriend — 31-year-old Seth Mazzaglia (muh-ZAYL'-yuh) — just to get a reduced sentence.

Mazzaglia is charged with first-degree murder in the October 2012 death of 19-year-old Elizabeth "Lizzi" Marriott of Westborough, Massachusetts. Prosecutors say he and McDonough dumped her body in a river. It has not been recovered.

Seth Mazzaglia is escorted out of the court room for the lunch break after listening to his former girlfriend tell jurors how Elizabeth "Lizzi"
Seth Mazzaglia is escorted out of the court room for the lunch break after listening to his former girlfriend tell jurors how Elizabeth "Lizzi" Marriott, was killed during his first-degree murder trial Wednesday, June 4, 2014 in Strafford County Superior Court in Dover, N.H. (AP Photo/Jim Cole, Pool) (Jim Cole/AP)

McDonough testified Thursday the imaginary characters she began creating during childhood were just "masks" to help her get through difficult situations.



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Kathryn McDonough testifies Wednesday, June 4, 2014 how she saw Elizabeth "Lizzi" Marriott’s arms curl up as her boyfriend was strangling
Kathryn McDonough testifies Wednesday, June 4, 2014 how she saw Elizabeth "Lizzi" Marriott's arms curl up as her boyfriend was strangling her during testimony in Strafford County Superior Court in Dover, N.H. McDonough is the state's key witness against her former boyfriend Seth Mazzaglia charged with first-degree murder in the 2012 death of Marriott of Westborough, Mass., in Dover, NH (AP Photo/Jim Cole) (Jim Cole/AP)

Kathryn McDonough is is led by sheriff’s deputies after testifying during her former boyfriend Seth Mazzaglia’s first-degree murder trail at
Kathryn McDonough is is led by sheriff's deputies after testifying during her former boyfriend Seth Mazzaglia's first-degree murder trail at Strafford County Superior Court, Thursday, June 5, 2014, in Dover, N.H. Mazzaglia is on trial for allegedly killing Elizabeth "Lizzi" Marriott, a University of New Hampshire student, in his Dover N.H. apartment on Oct. 9, 2012. (AP Photo/Foster's Daily Democrat, John Huff, Pool) (John Huff/AP)