(Lake County, FL) Today, the Fifth Judicial Circuit State Attorney’s Office of State Attorney Bill Gladson announces the conviction and sentencing of 55-year-old John Joseph Marchlewski.

In the courtroom of Judge Brian Welke, jurors found Marchlewski guilty on all 15 counts of Possession of Child Pornography (10 or More Images). Marchlewski was consecutively sentenced to 15 years in prison on each charge, cumulating a 225-year sentence.

“Of the disturbing videos this defendant possessed of very young children being sexually abused, one was less than two years old – just a toddler. The mere thought of someone abusing a toddler, or any child, for their own sexual gratification is sickening,” said Bill Gladson, Fifth Judicial Circuit State Attorney. “My office remains unwavering in combatting child sexual exploitation and abuse. Whether you are the pedophile producing the material or the deviant viewing and sharing it, we will charge you and make sure you are punished to the fullest extent possible by law.”

Marchlewski was arrested in May of 2023 following a Florida Department of Law Enforcement (FDLE) investigation after law enforcement officials received a cyber tip from the National Center for Missing and Exploited Children indicating an online user had uploaded files containing child pornography.

During their investigation, officials determined Marchlewski, a registered sex offender, was the owner of the accounts that contained child sexual abuse material. After obtaining a search warrant, detectives responded to Marchlewski’s residence, where they made contact with the defendant and seized his cellular device.

A forensic examination of the defendant’s device was conducted, revealing the files containing the child pornography.

Assistant State Attorneys Tyler Duffy and Karli Hurbanis successfully prosecuted this case.

Published on 04/15/2026.