The Case of Kristil Krug

Kristil Krug, a 43-year-old biochemical engineer and mother of three, was murdered at her Broomfield, Colorado home on 14 December 2023. For weeks before her death, she believed she was being stalked by a former boyfriend. Investigators later determined the campaign of harassment had been orchestrated by her husband, Daniel Krug, who was convicted of first-degree murder in 2025.

Kristil Krug was a biochemical engineer, devoted mother of three and respected member of her community in Broomfield, Colorado. During October 2023, she began receiving disturbing emails, text messages and photographs from someone she believed was a former boyfriend from two decades earlier. The messages became increasingly threatening and referenced private details of her daily life, including visits to appointments and her family's movements. Concerned for her safety, Kristil contacted police, hired a private investigator, installed additional home security and began carrying a concealed firearm. She carefully documented every threatening communication in what became known as her "stalker log." Unknown to Kristil, investigators later determined the stalking campaign had not been carried out by her former boyfriend. Prosecutors alleged it had been meticulously orchestrated by her husband, Daniel Krug, using fake email accounts, burner phones and false identities in an attempt to manipulate, frighten and isolate her before ultimately killing her.

On the morning of 14 December 2023, Kristil returned home after dropping her children at school. Investigators determined Daniel Krug was waiting inside the family home. Prosecutors alleged he attacked Kristil in the garage, striking her repeatedly with a blunt object before fatally stabbing her in the chest. Several hours later, Daniel contacted police requesting a welfare check after claiming he had been unable to reach his wife. Officers responding to the home discovered Kristil unconscious in the garage suffering severe head injuries and a stab wound. She was pronounced dead shortly afterwards. Investigators also discovered evidence that the home's security system had been disabled and a doorbell camera deliberately covered before the attack.

Broomfield Police initially examined whether the former boyfriend believed to be stalking Kristil could have been responsible. Investigators quickly established that he lived in Utah and had a verified alibi, eliminating him as a suspect. Digital forensic investigators then traced the anonymous emails, fake accounts and burner phones used during the stalking campaign. The evidence led directly to Daniel Krug's workplace and devices. Investigators discovered internet searches relating to head injuries, unconsciousness and methods of assault. They also linked burner phones and gift cards used to create the fake identities to Daniel. Police concluded Daniel had spent approximately two months terrorising his wife while impersonating her former boyfriend before murdering her. Daniel Krug was arrested on 16 December 2023 and charged with first-degree murder, stalking and criminal impersonation.

Daniel Krug stood trial in 2025. Prosecutors argued he had carried out an elaborate and calculated stalking campaign designed to frighten Kristil and frame an innocent former boyfriend before killing her. After deliberating, the jury found Daniel Krug guilty of: First-degree murder. Stalking (extreme emotional distress). Stalking involving a credible threat. Criminal impersonation. In April 2025, he was sentenced to life imprisonment without the possibility of parole for Kristil's murder, together with an additional consecutive sentence for the stalking and impersonation offences. Daniel continues to maintain his innocence.