MILWAUKEE (CBS 58) -- In September of this year, Homeland Security Investigations (HSI) in Milwaukee was contacted by HSI Attache in London for help in a child exploitation investigation involving an individual within the Milwaukee area, who expressed interest in traveling to the United Kingdom (UK) to engage in sexual activity with a minor. 

Authorities say, back in July of 2025, London's HSI was requested to help identify an email user that was the target of a child sexual exploitation (CSE) investigation. 

The user was later identified to be 46-year-old Justin Kagerbauer. 

Kagerbauer made comments about a child on a profile fabricated by UK law enforcement, stating that he was interested in girls "6+," according to the complaint. 

He chatted with an undercover officer, making sexual comments towards the 'child' on the profile. Prosecutors say, in September of 2025, he stated that he would be in the UK in November while expressing his continued sexual interest with the minor. 

Law enforcement eventually linked the user to Kagerbauer. 

Kagerbauer was charged with multiple sex crimes