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In murder trial, ex-girlfriend says she sought to protect Mazzaglia

  • Joachim Barth, defense attorney for Seth Mazzaglia, questions Kathryn McDonough, 20, former girlfriend of Seth Mazzaglia, during her tesimony at Strafford County Superior Court in Dover, N.H., on Friday, June 6, 2014. Mazzaglia is charged with first-degree murder in the October 2012 death of 19-year-old Elizabeth "Lizzi" Marriott's of Westborough, Mass. (AP Photo/Union Leader, David Lane, Pool)

    Joachim Barth, defense attorney for Seth Mazzaglia, questions Kathryn McDonough, 20, former girlfriend of Seth Mazzaglia, during her tesimony at Strafford County Superior Court in Dover, N.H., on Friday, June 6, 2014. Mazzaglia is charged with first-degree murder in the October 2012 death of 19-year-old Elizabeth "Lizzi" Marriott's of Westborough, Mass. (AP Photo/Union Leader, David Lane, Pool)

  • Seth Mazzaglia of Dover, N.H., is escorted into the courtroom at Strafford County Superior Court in Dover, N.H., on Friday, June 6, 2014. Mazzaglia is charged with first-degree murder in the October 2012 death of 19-year-old Elizabeth "Lizzi" Marriott's of Westborough, Mass. (AP Photo/Union Leader, David Lane, Pool)

    Seth Mazzaglia of Dover, N.H., is escorted into the courtroom at Strafford County Superior Court in Dover, N.H., on Friday, June 6, 2014. Mazzaglia is charged with first-degree murder in the October 2012 death of 19-year-old Elizabeth "Lizzi" Marriott's of Westborough, Mass. (AP Photo/Union Leader, David Lane, Pool)

  • Kathryn McDonough, right, gets escorted into the courtroom in the Seth Mazzaglia trial at Strafford County Superior Court in Dover, N.H., on Friday, June 6, 2014. McDonough will be back on the witness stand for cross-examination. Mazzaglia is charged with first-degree murder in the October 2012 death of 19-year-old Elizabeth "Lizzi" Marriott's of Westborough, Mass. (AP Photo/Union Leader, David Lane, Pool)

    Kathryn McDonough, right, gets escorted into the courtroom in the Seth Mazzaglia trial at Strafford County Superior Court in Dover, N.H., on Friday, June 6, 2014. McDonough will be back on the witness stand for cross-examination. Mazzaglia is charged with first-degree murder in the October 2012 death of 19-year-old Elizabeth "Lizzi" Marriott's of Westborough, Mass. (AP Photo/Union Leader, David Lane, Pool)

  • Kathryn McDonough, 20, the former girlfriend of defendant Seth Mazzaglia, leaves the courtroom at Strafford County Superior Court in Dover, N.H., on Friday, June 6, 2014.  Mazzaglia is charged with first-degree murder in the October 2012 death of 19-year-old Elizabeth "Lizzi" Marriott  of Westborough, Mass. (AP Photo/Union Leader, David Lane, Pool)

    Kathryn McDonough, 20, the former girlfriend of defendant Seth Mazzaglia, leaves the courtroom at Strafford County Superior Court in Dover, N.H., on Friday, June 6, 2014. Mazzaglia is charged with first-degree murder in the October 2012 death of 19-year-old Elizabeth "Lizzi" Marriott of Westborough, Mass. (AP Photo/Union Leader, David Lane, Pool)

  • Joachim Barth, defense attorney for Seth Mazzaglia, questions Kathryn McDonough, 20, former girlfriend of Seth Mazzaglia, during her tesimony at Strafford County Superior Court in Dover, N.H., on Friday, June 6, 2014. Mazzaglia is charged with first-degree murder in the October 2012 death of 19-year-old Elizabeth "Lizzi" Marriott's of Westborough, Mass. (AP Photo/Union Leader, David Lane, Pool)
  • Seth Mazzaglia of Dover, N.H., is escorted into the courtroom at Strafford County Superior Court in Dover, N.H., on Friday, June 6, 2014. Mazzaglia is charged with first-degree murder in the October 2012 death of 19-year-old Elizabeth "Lizzi" Marriott's of Westborough, Mass. (AP Photo/Union Leader, David Lane, Pool)
  • Kathryn McDonough, right, gets escorted into the courtroom in the Seth Mazzaglia trial at Strafford County Superior Court in Dover, N.H., on Friday, June 6, 2014. McDonough will be back on the witness stand for cross-examination. Mazzaglia is charged with first-degree murder in the October 2012 death of 19-year-old Elizabeth "Lizzi" Marriott's of Westborough, Mass. (AP Photo/Union Leader, David Lane, Pool)
  • Kathryn McDonough, 20, the former girlfriend of defendant Seth Mazzaglia, leaves the courtroom at Strafford County Superior Court in Dover, N.H., on Friday, June 6, 2014.  Mazzaglia is charged with first-degree murder in the October 2012 death of 19-year-old Elizabeth "Lizzi" Marriott  of Westborough, Mass. (AP Photo/Union Leader, David Lane, Pool)

A former girlfriend of a man accused of raping and strangling a University of New Hampshire student said she still loved him and wanted to protect him even after she was granted immunity from prosecution.

Seth Mazzaglia is charged with first-degree murder in the October 2012 death of 19-year-old Elizabeth “Lizzi” Marriott of Westborough, Mass.

His ex-girlfriend, Kathryn “Kat” McDonough, the state’s star witness, originally told defense investigators that she and Marriott were engaged in rough sex involving restraints when Marriott died. She told jurors this week that Mazzaglia killed Marriott when she rejected his advances.

McDonough, 20, testified that even after being granted immunity for her testimony about Marriott’s death at a grand jury investigation in February 2013, she still loved Mazzaglia, 31, and wanted to protect him.

“At the time I was more worried about not being able to see him again,” she testified yesterday. “But I knew if I were to lie to them, it would be even longer before I could see him.”

McDonough spent two days this week being questioned by prosecutor Peter Hinckley, and yesterday marked her second day of cross-examination by defense attorney Joachim Barth. Barth will continue his attempt to attack her credibility Monday, when cross-examination will move on to the former couple’s sadomasochistic sexual relationship.

Barth has spent much of his cross-examination attempting to get McDonough to admit she was driven by the voices in her head of five imaginary characters she created. She acknowledged she created them to mask her own weaknesses during childhood and adolescence but was unwavering that the characters did not influence her thinking.

Asked why she didn’t tell the grand jury about her characters, McDonough said she answered the questions she was asked.

“It was the first time I had told the truth about how Seth murdered Lizzi,” she testified. “I was scared. . . . I was talking about a lot of things that happened.”

The prosecution in its opening statement portrayed McDonough as a woman who was emotionally and sexually dominated by Mazzaglia, whom she met when she was 17 and he was 28. She moved in with him four months before she graduated high school.

Barth mocked a response by McDonough that was based on her recollection of a conversation she had with Mazzaglia that’s unsubstantiated by Facebook or text messages, saying, “I guess we have to take your word for that.”

“You could ask him,” she replied, referring to Mazzaglia, who’s not expected to testify.

McDonough said Mazzaglia was preoccupied with finding another woman to join their sexual relationship and instructed her to solicit some on fetish websites.

McDonough said that after she left to teach a 12-day theater camp in August 2012 and failed to find him a sexual surrogate during her absence, he punished her with brutal sex in which he bound, slapped and pinched her, and pulled her hair. She said he also outlined a second punishment: He told her to bring a friend of hers to offer him as a sex slave.

That friend was Marriott, her co-worker.

McDonough testified that Marriott willingly played a game of strip poker with the couple the night of Oct. 9, 2012, but twice refused Mazzaglia’s sexual advances. As the women sat with their backs against a futon watching a movie, McDonough said, Mazzaglia looped a rope around Marriott’s neck and strangled her until she was unconscious. McDonough said he then raped her motionless body.

The couple then used Marriott’s car to drive to Peirce Island and dump her body into a river that feeds into the ocean, she said. The body has not been recovered.

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