CHICAGO (AP) — Authorities say a Chicago man has been charged with sexually assaulting a 7-year-old female relative in an act witnessed in an online forum used for remote teaching.

Police say 18-year-old Catrell Walls is charged with a felony count of predatory criminal sexual assault of a victim under 13.He was ordered held without bond Saturday.

Walls was seen via an online learning application performing a sexual act with the child about 1:30 p.m. Thursday. Walls’ attorney says he has been diagnosed with attention deficit hyperactivity disorder, which impairs his ability to control his impulses.