'Fatal Vision' Murders: Alleged Killer May Be Set Free

New DNA evidence could prove man innocent of killing his wife, daughters.
3:00 | 09/16/12

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Transcript for 'Fatal Vision' Murders: Alleged Killer May Be Set Free
We may be on the cusp of a major development in one of the most notorious murder. It spawned a best-selling book. A clean-cut doctor in green beret accused of stabbing his pregnant wife and daughters. Can this man now be set free? Rob nelson is on the story. Amazing story here. This case was literally the talk of the nation decades ago, a gruesome tale. A family murder after the charlie manson killings. It was the twisted, grisly murder case in north carolina. That stunned and captivated the nation more than 40 years ago. One of the nation's most controversial murder cases. A jury in raleigh, north carolina. Fascination over the case was so intense, it spawned not only the best-selling book "fatal vision." We want to get the whole story, captain. It spawned a mini series in 1984. And through it all one central haunting question -- did jeffery McDONALD REALLY STAB AND BEAT TO Death his pregnant wife and two young daughters in their own home? Or as he has maintained for decades that he's innocent and intruders actually killed them? I can't prove that I'm not that monster. 33 years of he was convicted of the gruesome crime, the case is back in court on monday. As the judge continues new dna evidence and new witness testimony. This is extremely significantly. This is a man that received three life sentences. And has been in prison for much of his life and now the possibility is that he could be release zmrd dna evidence wasn't available back in 1979 when he was convicted and his supporters say that genetics from the scene don't match the family. It's a decision that the new book appears to support. The case has bothered me for years. Now, he's now 68 years old. He's not eligible for parole until 2020, the judge in the case could decide within two weeks, whether to order a new trial or exonerate this guy a. Rob, thank you. An apparently growing problem with those trust we enforcing our laws.

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

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