A sensational murder trial in New Hampshire is drawing comparisons to the Amanda Knox case in Italy. A 31-year-old man, Seth Mazzaglia (shown above, right), is accused of first-degree murder in the 2012 death of 19-year-old University of New Hampshire student Elizabeth Marriott.

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He is accused of raping and strangling Marriott after she rejected his sexual advances, but he told investigators that Marriott died during consensual rough sex.

Marriott went to Mazzaglia's apartment for an alleged sexual rendezvous with him and his girlfriend.

Attorney Heather Hansen explained on Happening Now this afternoon that one problem for prosecutors is the fact that Marriott's body has never been found. Mazzaglia and his then-girlfriend Kathryn McDonough (shown above, left) are accused of disposing of the body in a river.

McDonough is set to testify against Mazzaglia at trial and admit that the two dumped the body.

Hansen said another concerning fact for prosecutors is that McDonough made a plea deal that landed her in prison for only 18 months to three years.

Former prosecutor Dan Schorr agreed that the sentence for McDonough is very lenient since she admits to disposing of a body. The defense argues that McDonough is the one responsible for Marriott's death, suffocating her during consensual rough sex.

Hansen noted that all the defense needs is one juror with "reasonable doubt" as to which person committed the murder.

Read more on the opening testimony of the trial from the Union Leader.

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