Kristil Krug, a married mother of three living in a Denver suburb, was bludgeoned and stabbed to death in her own garage just 11 days before Christmas. Her killer was not the teenage ex-boyfriend she feared—it was her husband, Daniel Krug, who had spent months impersonating the young man to terrorize his family.

The case, featured in ABC's *20/20* Season 48 premiere episode titled "He's Right Behind You," aired Friday, September 26, 2025, and presents one of the most chilling examples of domestic deception leading to murder. Kristil believed she was being stalked by her ex-boyfriend, Jack Anthony Holland, after receiving threatening messages and sensing someone watching her. She reported the harassment to police, shared communication logs with investigators, and worked closely with law enforcement and her husband to track down the supposed stalker.

What Kristil didn't know was that the man sleeping in a separate bedroom down the hall was orchestrating the entire nightmare.

Police investigation eventually turned to Daniel Krug himself. Cell phone forensics pinpointed his location during times when the mysterious stalker had been active, exposing the elaborate deception. Daniel had been using burner phones to contact his wife, posing as her ex-boyfriend while simultaneously positioning himself as a concerned husband working with authorities to catch the perpetrator. Prosecutors described him as a "puppet master" who was "losing control" and in denial about his deteriorating marriage.

Daniel admitted during police questioning that their marriage had been falling apart for some time. The couple slept in separate bedrooms, and he claimed he had asked for a divorce. Rather than accept the end of his marriage, he constructed an elaborate psychological trap—one that ultimately ended in murder.

The investigation uncovered body camera footage showing Kristil and Daniel working with police, unaware that her husband was the very person they were hunting. In one particularly disturbing moment, Daniel called the non-emergency police line reporting that his wife wasn't responding to texts or calls—a report that would have chilling significance once her body was discovered.

Fearing for her safety, Kristil had armed herself for protection. But no weapon could shield her from the man she trusted most.

The *20/20* episode includes interviews with Kristil's parents, key investigators, prosecutors including Deputy District Attorney Kate Armstrong, and Jack Anthony Holland, the ex-boyfriend who was wrongly suspected and eventually cleared. The episode provides a forensic breakdown of how digital evidence exposed Daniel's deception, tracing burner phone locations and digital footprints that proved impossible to hide once investigators knew where to look.

This case serves as a stark reminder that the most dangerous person in a victim's life is often the one closest to them. Kristil's story—one of systematic psychological manipulation followed by brutal violence—highlights the critical importance of digital forensics in modern criminal investigations and the sophisticated methods abusers employ to control and ultimately harm their victims.

The case also raises questions about the warning signs that may have been missed and the challenges domestic violence victims face in recognizing danger when it comes from within their own home.

**Sources**

https://abcnews.com/US/colorado-womans-stalker-turns-husband-shocking-murder-case/story?id=124780858

https://www.laughingplace.com/entertainment/abc-2020-hes-right-behind-you/

https://ontheflix.com/2025/09/26/new-20-20-september-26-episode-to-feature-a-horrific-stalker-scandal/

https://www.youtube.com/watch?v=bv2qTGREo5k

https://www.instagram.com/reel/DPMZ06cjB-d/