In a chilling case of deception and domestic violence, what appeared to be months of stalking by an ex-boyfriend turned out to be an elaborate scheme orchestrated by a Colorado woman's own husband, culminating in her murder just days before Christmas.

Kristil Krug, a 44-year-old chemical engineer and mother of three from Broomfield, was discovered dead in her garage by an officer on Dec. 14, 2023, after responding to a welfare check requested by her husband Daniel Krug.

According to police recordings, Daniel called the non-emergency line saying, "I don't think this is an emergency, but this feels really weird... my wife isn't responding to text messages or phone calls."

A new "20/20" episode, "He's Right Behind You," airing Friday, Sept. 26, at 9 p.m. ET on ABC and streaming the next da

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