A Haysville couple will spend more than a decade each in federal prison after investigators traced hundreds of child sexual abuse files to their cellphones.
Gavin Onuffer, 28, a U.S. Marine Corps maintenance chief, was sentenced Aug. 19, 2026, to 121 months (10 years and one month) after pleading guilty to one count of receipt of child pornography, according to a U.S. Attorney's Office press release.
His wife, Addilynn Onuffer, 22, was sentenced in May 2026 to 160 months, approximately 13 years and four months, after pleading guilty to one count of distributing child pornography.
U.S. Attorney Ryan A. Kriegshauser announced the sentencing and said people who "take pleasure in viewing, creating, or distributing images of little children being sexually exploited are a danger to our society and belong behind bars."
How the investigation started
The case began in July 2024 when the National Center for Missing and Exploited Children received a cybertip from Kik, a mobile messaging app, that a user had uploaded dozens of sexually explicit files of children, the Wichita Eagle reported. The activity on the platform occurred in June and July 2024.
A Wichita Police Department detective obtained a search warrant for data tied to the Kik account and matched the IP address to the Onuffers' Haysville home. That search yielded 17 files of children engaged in sex acts.
Investigators then executed a search warrant on Gavin Onuffer's cellphone. They found more than 351 files in a password-protected folder, a majority of which were sexual in nature, according to an affidavit in the case. The images depicted prepubescent girls subjected to sexual conduct, the U.S. Attorney's Office said.
Additional child exploitation files were found on both phones, sent between the couple via Discord. According to Addilynn Onuffer's plea agreement, she sent her husband the images because he "wanted to receive" them.
What the couple told investigators
Addilynn Onuffer told police she had used Kik to exchange child pornography and that she and her husband had watched pornography on their phones together, according to a federal court complaint.
Gavin Onuffer disputed the scope. He told investigators he had received child pornography online but claimed he would delete the content and block the sender, the complaint states.
Agencies involved
The Kansas Internet Crimes Against Children Task Force and the Wichita Police Department jointly investigated the case. It was prosecuted as part of Project Safe Childhood, a Department of Justice initiative.
Kriegshauser asked anyone who knows someone engaging in child sexual exploitation to report it to law enforcement.
