Nicholas S. Kachiroubas, 45, of Crystal Lake, was arrested on Tuesday on sex crime charges following an investigation by the McHenry County Sheriff’s Office. | Photo – Left: Provided; Photo – Right: DePaul University

The city clerk in Crystal Lake has been arrested on charges alleging he possessed child pornography and enticed children online for sexual acts, officials said.

The McHenry County Sheriff’s Office said Tuesday that they began a sex crimes investigation in April following a tip from another agency.

The National Center of Missing and Exploited Children provided the sheriff’s office with information received from the Internet Crimes Against Children Data System.

That information pertained to the “online enticement of children for sexual acts,” the sheriff’s office said.

Nicholas S. Kachiroubas, 45, of Crystal Lake, was identified as the offender in the investigation.

The sheriff’s office said Kachiroubas possessed child sexual abuse material and committed grooming, which is when a person uses an electronic device to seduce, lure or entice a child to commit a sex offense.

The McHenry County Sheriff’s Office Criminal Investigations Division served a search warrant at Kachiroubas’ residence in the 200 block of South Dole Avenue in Crystal Lake on Tuesday.

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Kachiroubas was taken into custody as a result of the warrant and transported to the McHenry County Jail.

Kachiroubas was charged with possession of child pornography, a Class 2 felony, and grooming, a Class 4 felony.

Kachiroubas is the city clerk for the City of Crystal Lake and has held the position since 2009.

He is also an associate teaching professor in the School of Public Service at DePaul University in Chicago.

Kachiroubas serves as a board member of the Illinois Community College Board, a position he has held since 2016.

He remains held in the jail pending an initial appearance hearing on Thursday afternoon.