Matthew R. Reder, 25, of McHenry.

A McHenry man was sentenced to 40 years in prison after pleading guilty to filming himself sexually assaulting a young child at a Cary apartment.

Matthew R. Reder, 25, of the 500 block of Sunrise Street in McHenry, was indicted on 32 counts of child pornography, three counts of predatory criminal sexual assault of a child under 13, possession of a controlled substance, criminal trespass to building, criminal damage to property, resisting a peace officer and aggravated assault of a peace officer.

Reder was arrested on February 21, 2020, following a several hour-long standoff with police officers and a SWAT team in Crystal Lake.

The incident began after the Crystal Lake Police Department responded to the 500 block of Darlington Lane for a report of a burglary in progress.

Officers arrived on the scene and met with a man, later identified as Reder, inside the residence who threatened officers with a knife and immediately barricaded himself inside the bathroom.

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“Officers set up a perimeter on the residence and continued to talk with the armed subject in an attempt to de-escalate the situation. Additional police units were called to the scene to assist with the incident,” Crystal Lake Deputy Police Chief Thomas Kotlowski said at the time.

After several hours of negotiations, Reder surrendered to police and a SWAT team without incident.

Reder had an active arrest warrant at the time of his arrest for a sexual assault case, court records show.

Those charges stem from an incident in October 2019 in which Reder allegedly sexually assaulted a child under the age of 13 in the bathtub of a Cary apartment, according to a criminal complaint.

Detectives recovered video and photos that they say Reder recorded during the assault.

On Wednesday, the McHenry County State’s Attorney’s Office reached a negotiated plea deal with Reder.

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Reder pleaded guilty to one count of predatory sexual assault of a child under 13 and prosecutors dropped his dozens of other charges.

McHenry County Judge Michael Coppedge sentenced Reder to 40 years in prison, which will be served at 85% of the sentence.

He will be required to register as a sex offender for life upon his release from the Illinois Department of Corrections.

The case was investigated by Detective Dave Eitel of the Crystal Lake Police Department and prosecuted by Randi Freese of the McHenry County State’s Attorney’s Office.