Scott Peterson Makes New Claim About Who Saw Murdered Wife Laci Peterson Last

Scott Peterson is speaking out for the first time since he was found guilty of murdering his wife and unborn child almost 15 years ago.

Peterson was convicted of the murders of his wife Laci Peterson and unborn child Conner and sentenced to death by lethal injection in 2005, Daily Mail reports.

Peterson spoke out from death row in an interview for an upcoming A&E documentary series, The Murder of Laci Peterson, which premieres on Tuesday. The six-part series will take a closer look at the case and Laci's 2002 Christmas Eve disappearance while eight months pregnant.

In the interview, Peterson claims he was not the last person to see Laci before she went missing. "I wasn't the last one to see Laci that day. There were so many witnesses that saw her walking in the neighborhood after I left," he says in the interview, which was conducted over the phone from San Quentin State Prison in California this past June by his sister-in-law Janey.

Eleven witnesses, who claim to have seen Laci walking her dog after she reportedly went missing on Christmas Eve, support his claim.

Peterson's interview will also touch on his relationship with his mistress Amber Frey.

Prosecutors were able to successfully argue that Laci was killed sometime between the night of December 23 and the following morning during Peterson's murder trial. However, the 11 witnesses are telling a different story.

One witness, named Mike Chiavetta, says he saw Laci walking her dog in the neighborhood on Christmas Eve after Peterson left to go to his office. "After I had talked to the police man and given my statement that I had seen the dog in the park nothing was followed up," says Chiavetta.

"There was over 11 witnesses who saw Laci that day, this is all while Scott is at the office and on his computer, so he's innocent," argues Janey.

Conner's body was discovered first four months after the soon-to-be mother went missing. He was found washed up on the shoreline near Berkley in April 2003 with a nylon rope around his neck and a large cut on the body.

The following day, Laci was found a mile away on the shoreline with tape wrapped around her torso.

Since both bodies were too decomposed, no forensic evidence was found for the case. "There was no biological evidence, no forensic evidence, that pointed to the guilt of Scott Peterson whatsoever," a member of Peterson's legal team states.

In the interview, Peterson talks about Frey for the first time and explains why he continued talking to her after Laci's disappearance. He claims he wanted to make sure Frey wouldn't talk to the press about the situation because if she did, it could have possibly stopped the authorities' search efforts.

"The overriding reason throughout it all was she starts giving media interview, there is no more search for Laci and Conner," says Peterson.

"I'd just seen what happened to the search for Chandra levy. There was no more search for her."

He then adds: "Every hour I could buy to keep the search going is all solved if I bring Laci and Conner home."

He also admits he "had no idea it was coming," when referring to his guilty verdict.

His defense team argued that Laci's murder was most likely connected to a burglary that occurred across the street from the house they shared.

Peterson is currently in the appeal process for this case.

The documentary's executive producer John Marks told ABC News that the witnesses' claims will "surprise" people.

"I think when you listen to the witnesses who say they saw Laci in the park, I think that will be really…that will be kind of a surprise."

The six part docuseries premieres on A&E on Tuesday, Aug. 15, at 10 p.m. ET.

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