Crime Scott Peterson Prosecutors Speak Out on Upcoming 'Dateline' : 'He Wanted a Different Life' "There's something underneath the surface that is truly evil," says Peterson prosecutor Birgit Fladager By Christine Pelisek Published on April 19, 2017 10:33 AM Share Tweet Pin Email Convicted killer Scott Peterson “wanted a different life,” and that’s why he killed his wife Laci and their unborn son Conner. So says Peterson prosecutor Birgit Fladager, who is interviewed on an upcoming two-hour NBC Dateline special airing Friday. “The reason for the murder was he didn’t want to be married anymore and he didn’t want to have a child,” Fladager said during the two-hour episode, which airs Friday, April 21, at 9 p.m. ET/PT, 8 p.m. CT. “He wanted a different life. He didn’t want what he had.” Laci Peterson was eight months pregnant when she disappeared from her Modesto home on Christmas Eve day of 2002. Her body was found in April 2003 in the San Francisco Bay. Peterson claimed that Laci was killed as she walked the couple’s dog after Peterson left to go on a solo fishing trip on Christmas Eve morning. However, a jury didn’t buy Peterson’s claims and convicted him in 2004. Peterson was later sentenced to death by lethal injection in March of 2005. He is currently incarcerated at San Quentin State Prison in California. Fladager described the former fertilizer salesman as “smooth.” “He doesn’t care about anyone but himself, he can be very smooth,” she said. “But there’s something underneath the surface that is truly evil.” AP “Laci and Conner were responsibilities and he didn’t want that,” co-prosecutor Dave Harris told correspondent Keith Morrison. • Want to keep up with the latest crime coverage? Click here to get breaking crime news, ongoing trial coverage and details of intriguing unsolved cases in the True Crime Newsletter. The broadcast also features interviews with Peterson’s ex-girlfriend Amber Frey, Laci’s mother, and now-retired detective Allen Brocchini of the Modesto Police Department. During the episode, Brocchini said that Peterson denied knowing his wife’s whereabouts hours after he first reported her missing. “What you’re telling me, Scott, is there’s no — you have no idea where Laci is?” Brocchini asked Peterson in newly released- interrogation video. “I do not,” Peterson replied. His answers during that police questioning raised immediate red flags, said Brocchini. “He has an answer,” said Brocchini. “And he doesn’t elaborate, doesn’t get emotional.” The Laci Peterson Story: A Dateline Investigation airs Friday, April 21 at 9 p.m. ET/PT, 8 p.m. CT.