Valedictorian Murder Trial: Testimony Abruptly Ends

Dan Abrams discusses the prosecution's desire to charge Jeffrey Pyne with lesser charges.
3:20 | 12/14/12

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Transcript for Valedictorian Murder Trial: Testimony Abruptly Ends
We're going to get to the trial of the high school valedictorian accused of killing his own mother. It's now in closing arguments. And his father is speaking out. John muller joins us with the latest. Reporter: In closing arguments, prosecutors telling jurors this murder case is like a puzzle and they have all of the pieces to convict jeffrey pyne of killing his mother. They talk about how things were wrong in that house and his mother were very sick. But they say that's no excuse for murder. This morning, just before the case of jeffrey pyne goes to a jury, his father is speaking out, in his defense. It's a tough thing to go through. All I can tell you is that, i know my son. And my son would never harm his mother. He would never harm her. Reporter: Bernie pyne told reporters outside of court thursday the case against his son is not rooted in fact. Just hours earlier, the prosecution said the opposite in their closing arguments. When he's going to get that board, you can infer from that that he has an intent to kill her when he goes to get the board. There's no other reason to go and get that board. Reporter: Telling jurors the former high school valedictorian had bludgeoned his mother to death in 2011 in the family garage. Prosecutors say ruth pyne was mentally ill and abused her son for years. They don't have any physical evidence. Reporter: What prosecutors have, are these photos of jeffrey pyne's blistered hands, taken shortly after the crime. Pyne says came from throwing wooden storage pallets at his job. They had a lot of medical testimony his story how that happened is unlikely. Reporter: This morning, the community to supported the 22-year-old biology student remains skeptical. I feel very confident that jeffrey is innocent and that the jury will see it my way also. Reporter: As does his father. We're going to trust the system works. He has a 12-year-old sister. And she wants her brother home for christmas. Reporter: And the judge has ruled that the jury can consider not only first-degree murder charges against jeffrey pyne, but also second-degree murder charges. The defense will present their clo closing arguments after presenting no witnesses. We'll know soon. And for more, now, let's bring in "gma" legal analyst, dan abrams. We hear the prosecution got the lower charges. They don't have to prove premeditat premeditation. How big a win is this for them? It's a huge win. This is not an easy case. And the fact that second-degree murder is on the table, these jurors can compromise. That's what the defense is concerned about. That's why the defense opposed this. They didn't want the option of second-degree murder. They wanted to force prosecutors to prove premeditation, which is not easy in this case. There's real questions. Questions about the alibi. Questions about the injuries on his hands. Proving premeditation would have been difficult. And I think it's unlikely there will be a first-degree murder conviction. And the defense is scheduled to give its closing arguments today. Unusual for those arguments to be split? And what's the impact of that? It's not unusual. I think it's an advantage for prosecutors. This is a case where they have to put the pieces of the puzzle together. The jurors do. And to spend the nig with just the prosecution's closing argument in their minds is very helpful to the prosecution. The defense makes their closing arguments this morning. Dan abrams, keep your eye on this.

This transcript has been automatically generated and may not be 100% accurate.

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