Gory details of how Chris Watts strangled pregnant wife and smothered 2 daughters revealed in Netflix doc

GORY details of how Chris Watts killed his pregnant wife and their two daughters will be revealed in a new Netflix documentary.

Watts, 35, was sentenced to five life sentences for killing his wife Shanann and their kids Bella, four, and Celeste, three, in Frederick, Colorado, in 2018.

, provides an inside look at the Watts’ marriage and her murder that captivated the .

The film appears to be full of Shanann’s Facebook videos, home movies, wedding tapes, and security footage that chronicles their life – and the aftermath of the beloved mom’s death.

The trailer starts off with a friend reporting to police that she’s “concerned” about Shanann, who she said she hadn’t been able to get in touch with for a while.

In an old video from Shanann, she’s heard saying in the trailer: “I just want you to know a little bit of my story.

“I went through one of the darkest times of my life and then I met Chris and he’s the best thing that has ever happened to me.”

The trailer then jumps to Chris meeting with investigators after Shanann’s disappearance, telling them he suspected she left him.

While home footage of the family playing together rolls, surveillance tapes of Chris speaking with plays.

“I think about like, did I cause this?” Chris tells a law enforcement officer. “Did I make her feel like she needed to leave?”

The trailer includes Chris’ excuses to police to try to cover up his wife and kids’ murders.

Later in the preview, Chris is interrogated by a detective, who asked if Shanann accused Chris of anything, and questions if he “caused Shanann’s disappearance.”

The detective tells Chris: “There’s only one person in this room that knows what the truth is.

“In about five minutes, there’s gonna be two of us.”

The Netflix doc is set to premiere on September 30.

As authorities investigated what happened, Chris initially told cops he strangled Shanann after she smothered the two girls to death.

But he quickly said that was a lie, and claimed he was responsible for all their deaths, saying detectives suggested Shanann may have killed their children and he “just went with it.”

Chris said he strangled Shanann in their bed on August 13, 2018, after he told her their marriage was over and she said he would never see their children again.

The dad said his wife – correctly – suspected that he was having an affair, but he didn’t tell her about his ongoing relationship with a co-worker before killing her.

Investigators speculated that Chris wanted to “start over” with his co-worker, but he told investigators that the woman “never asked him to get rid of his family.”

After he strangled Shanann, Chris said Bella came into their bedroom clutching a blanket and asked what was wrong with mom – who the dad said just wasn’t feeling well.

Chris said he rolled up Shanann’s body in a sheet, put it on the floor of the backseat of his truck before placing the two girls on the backseat.

The dad said he didn’t plan to kill his daughters, but drove out to an oil worksite roughly 40 miles from their home.

When they got there and Chris took Shanann’s body out of the truck, one of the girls asked, “What are you doing to mommy?”

Chris said that’s when he smothered both Celeste and Bella, whose last words were: “Daddy, no!”

In a confession letter written from jail, Chris said he tried smothering the girls in their bed, but failed, as they woke up and saw him smothering Shanann – whose eyes were filled with blood.

He wrote: “Isn’t it weird how I look back and what I remember so much is her face getting all black with streaks of mascara.

“Her eyes filled with blood; as she looked at me and she died. I knew she was gone when she relieved herself.”

Chris claimed that if he was thinking that day in August 2018, the deaths wouldn’t have happened – but letters he wrote goes against that claim.’’

He writes of thinking to himself as he said goodnight to the girls the previous evening: “That’s the last time I’m going to be tucking my babies in.

“I knew what was going to happen the day before and I did nothing to stop it!”

Chris told investigators that he pleaded guilty to avoid a lengthy trial playing out before family.