A Redmond school teacher has been charged with four counts of communication with a minor for immoral purposes after allegedly engaging in sexually-explicit conversations with a fictitious 13-year-old in an online chat forum.

29-year-old Nathan Carey-Moreno Williams, taught at the private Brightmont Academy where he gave one-on-one instruction with students.

The Seattle Police Department Internet Crimes against Children Task Force worked as part of an FBI operation to conduct undercover chats targeting people with a sexual interest in children during this investigation.

According to charging documents, In addition to admitting to the inappropriate communications, he acknowledged that he had been sexually attracted to students, masturbating to thoughts of the fictitious 13-year-old child, and to having sexually explicit conversations with other minors previously.

Seattle Police referred the investigation to the King County Prosecuting Attorney’s Office on June 3 and, after an independent review, the office filed criminal charges on June 4.

The arraignment, where a plea is entered, is scheduled for 8:30 a.m. June 17 in room E1201A of the King County Courthouse.