 In a new ABC documentary about her pregnant daughter’s 2002 murder, Laci Peterson’s mother recalls her own mental anguish over the realization that Laci’s husband, Scott Peterson, might have been involved in her disappearance. ET) on ABC. In an exclusive clip from the third episode, airing Tuesday night, both Scott and a detective on the case at the time recall how he reacted to learning that his wife and unborn son were found dead months after Laci vanished in December 2002 in Modesto, California. I mean it was a really emotional, physical reaction.” 
 
 • PEOPLE’s special edition True Crime Stories: 35 Real Cases That Inspired the Show Law & Order is on sale now. Laci Peterson Family photo via The Modesto Bee/AP 
 
 Scott Peterson Justin Sullivan/AP 
 
 Scott Seeking Retrial 
 
 The two-hour ABC special — which also includes new interviews with investigators and those who covered the case — arrives as Scott Peterson continues to appeal the guilty verdict and death sentence he received 12 years ago. [There was] very little reaction on Scott’s part,” retired Modesto detective Jon Buehler recalls in the clip, adding, “In my view, because he was the one who killed Laci, there’s no reason for him to have a lot of emotion because he knew what the results were gonna be.” 
 
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 Laci Peterson Family photo via The Modesto Bee/AP 
 
 Scott Peterson in 2005 Justin Sullivan/AP 
 
 Buehler’s memory echoes what he previously told PEOPLE in 2005 about informing Scott of the bodies. In its 150-page response filed in court last month, according to the Bee, the California Attorney General’s Office counters that Peterson’s conviction resulted from “overwhelming evidence,” including: 
 
 “[H]is expressed wanderlust and desire to to be responsibility-free, which he conveyed to his mistress as the birth of his son neared; buying a boat mere weeks before Laci’s appearance; ‘fishing’ with the wrong gear on Christmas Eve morning in inclement weather; surreptitious trips to the marina in various rented vehicles after Laci’s disappearance; lies to friends and family concerning his whereabouts; the sale of Laci’s car and inquiry into selling their home, including furnishings; subscribing to pornography channels while the search was ongoing; Laci’s and Conner’s bodies washing ashore not far from Peterson’s location on the bay; condition of the bodies correlat(ing) with the timing of Laci’s disappearance; and (Scott) Peterson’s disguised appearance and possession of survival gear and copious amounts of cash at the time of his arrest.” 
 
 Mom Recounts Last Memory of Laci 
 
 In the ABC documentary, Laci’s mother describes the last time she saw her. “I still didn’t feel him kick even when she said that,” she says. “But she leaned over to me and she said, ‘Mom,’ she said ‘Scott doesn’t like to do this.’ She said, ‘I’ve asked him about, you know, feel my stomach when the baby kicks, and he never wants to touch my stomach.’” 
 
 “That really, really bothered me,” she says, “and that was the last time I saw her.” 
 
 The special also promises never-before-seen home video of Laci, excerpts from Scott’s pre-arrest interview with Diane Sawyer, and anchor Barbara Walters’ pre-conviction interview with Scott’s parents. Truth and Lies: The Murder of Laci Peterson airs Thursday, September 14 (9 p.m. and 11 p.m.
– Sharon Rocha was sitting on the couch next to her pregnant daughter, Laci Peterson, when the 27-year-old said the baby was kicking. "I put my hand on her stomach, because I’d never felt him kick," Rocha says in a new ABC documentary about her daughter's murder, per People. "She leaned over to me and she said, 'Mom,' she said 'Scott doesn’t like to do this.' She said, 'I’ve asked him about, you know, feel my stomach when the baby kicks, and he never wants to touch my stomach.' That really, really bothered me. And that was the last time I saw her." Peterson, eight months pregnant, disappeared soon after on Christmas Eve in 2002; her body and that of the son she was carrying washed ashore in California four months later and her husband, Scott, was eventually convicted of her murder; he is still fighting his guilty verdict and death sentence. In the documentary, which debuts Sept. 14, Rocha says the realization that Scott may have had something to do with her daughter's disappearance was a difficult one to accept. "It’s not like this is a total stranger that you might be suspecting," she says. "This is somebody that’s been a member of your family for several years now, and it’s really, you know, the back and forth and the guilt about feeling this way, and how it may have an effect on the relationship with my daughter if I’m wrong." She adds that Scott had been a member of the family she "loved and cared about," and that knowing how Laci felt about him made her not want to consider him a suspect. A&E is also currently airing a series on Laci Peterson's murder; People reported last week that in that series Scott Peterson was recently heard describing the "terrible physical reaction" he claimed to have upon finding out his wife and son were dead.