(FOX 46 WJZY) — A woman who says she had an intimate relationship with Chris Watts, the Colorado man who is set to be sentenced in the murders of his pregnant wide and two daughters, is now speaking out. 

In an exclusive interview with the Denver Post, Nichol Kessinger is telling her side of the story just days before Watts is scheduled to be sentenced to life in prison.

The 30-year-old Colorado native told the newspaper she started dating Watts, who was a co-worker of hers, less than two months before he killed his family.

Watts had reportedly told Kessinger that he had two daughters and was at the end of divorce proceedings. Kessinger said she had believed him at that time. 

Related: Christ Watts under suicide watch at Colorado jail, reports say

It wasn’t until Watts family disappeared that she quickly realized he had been lying, she told the newspaper.

“When I read the news, I found out he was still married and his wife was 15 weeks pregnant,” Kessinger explained. “I thought, ‘If he was able to lie to me and hide something that big, what else was he lying about?’” she said.

According to Kessinger, she barraged Watts with questions and he didn’t show any emotion during their conversations and tried to change the subject away from his missing family.

“It seemed off,” Kessinger told the Denver Post. “It got to a point that he was telling me so many lies that I eventually told him that I did not want to speak to him again until his family was found.”

Kessinger called the Weld County Sheriff’s Office and met with FBI investigators. Watts was arrested later that night. “I just wanted to help,” she said. “With a pregnant woman and two children missing, I was going to do anything that I could.”

The case gained attention in North Carolina after it was discovered that the victim, Shannan Watts, grew up in the state, and her and Chris Watts were married and lived in Mecklenburg County. 

Watts pleaded guilty to the murders last week and will be sentenced to life in prison on Monday, Nov. 19 if the judge accepts his plea deal.

“He’s a liar,” Kessinger said. “He lied about everything.”