Michael Peterson Free After Witness Discredited

The writer has been in jail for the murder of his wife since 2003.
2:39 | 12/16/11

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Transcript for Michael Peterson Free After Witness Discredited
Michael Peterson walked out of prison with the promise of a new trial and a chance at permanent freedom. I have waited. Over eight years. 2988. Days he kissed his grandchild born while he was behind bars serving a life sentence for killing his wife Kathleen. His release has been met with mixed emotions elation from his children. And their business utter dismay from the family of his second wife. I request that he stay down until well -- terrorist -- he's not -- His murder trial captured the nation carried live on cable inspiring a six hour documentary and a TV movie. It was ten years ago that Kathleen Peterson was found dead bloody at the bottom of the staircase in the couple's Durham, North Carolina mansion. Grunow only learned his. Streak coming watch well OK can feel -- what kind of accident okay. -- -- going to bring any relief conscious OK yeah I didn't know if he's not. OK -- Peterson told police his wife had been drinking and taking Valium and it accidentally tumbled down the stairs. You were called finding her in the documentary the staircase. -- -- remember. Unfortunately. -- -- -- -- -- -- -- But prosecutors said Kathleen was brutally murdered hit repeatedly with a fire poker. They told jurors Peterson was having an affair with a man and that of violent argument led to her death. Much -- their case was based on the testimony of state bureau of investigation agent Duane Deaver. He had passed -- -- -- -- consistent with these guys -- to -- But earlier this year the state fire Deaver after finding he had misrepresented evidence in more than thirty cases. A judge ruled Michael Peterson deserves a new trial. The State's going to be handicapped and it all goes back to Duane Deaver. There being less than honest. In his testimony. -- attorney told ABC news he did not perjure himself or mislead the jury in the original Pearson trial in any way. Peterson is out on a 300000 dollar bond and is required to Wear an electronic monitoring device will be staying in this house. Preparing for his second chance at justice. What I wanna do now that -- though it is to spend time with you know with my family. -- Good Morning America against Udinese ABC news Atlanta.

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

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