Shanann Watts’ parents knew her marriage was having problems and that her husband of nearly six years, Chris Watts, had grown distant and unloving — but, her mother advised her, give him his space. She had no idea what he would do next.

“She just couldn’t understand why he was so cold,” Shanann’s mom, Sandra Rzucek, explained to ABC News in an episode of20/20airing Friday night.

Frank Rzucek, Shanann’s father, joined herin their first-ever interview about the August triple homicideof Shanann and her kids, which attracted international attention.

In an exclusive clip from the sit-down (above), the Rzuceks describe how Shanann, 34, had noticed that Chris, 33, was acting strangely in a way that was difficult to understand.

“Nothing that was really — that I could physically see,” Frank told ABC. “Something wasn’t there, but [it] didn’t click to nobody.”

Sandra said the estrangement seemed to have been going on for a “few weeks, maybe a month.” Chris acted “just cold as ice,” she said, not replying, not responding.

“I just said, ‘Give him space,’ you know,” Sandra recalled. “But little did we know.”

From left: Sandra and Frank Rzucek.ABC News

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Shanann (left) and Chris Watts.Facebook

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Shanann was 15 weeks pregnant with a son, Niko, when she was killed.

“She was a good soul,” Frank told ABC in a previously released clip from the20/20episode.

“She [Shanann] would do anything for her children,” he said. “She just loved her children, and she wanted them to have everything growing up.”

Chris was arrested soon after the murders and confessed to killing his wife — but claimed he did so only after watching her strangle Celeste in apparent retaliation for announcing he wanted to split.

When in November Chris surprisingly pleaded guilty to all of his charges, to avoid being executed, he confirmed that earlier confession was a lie. He will spend the rest of his life in prison.

“The Rzuceks are utterly devastated,”20/20co-anchor Amy Robach, who interviewed Frank and Sandra and others for the episode, tells PEOPLE. “They told me that in one night they lost all their grandchildren and their only daughter, a daughter they video chatted with every single day.”

“However,” Robach continues, “they have a strong faith in God and that, along with their son, is what is getting them through each day. They are speaking out because they want to set the record straight about Shanann.”

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Chris himself has not been required to make a public confession as prosecutors do not believe he would tell the truth.

“I was just so shocked to hear from every single person we interviewed — close friends, family and co-workers — that there was absolutely no warning sign regarding Chris,” Robach tells PEOPLE. “Everyone told us he was a loving father and husband and an all-around good guy. It became for me the most chilling part of the story. Do you ever really know who you’re married to, do you ever know what someone is capable of?”

20/20airs Friday (10 p.m. ET) on ABC.

source: people.com