Matthew Oppenhagen, 35, of Rockford.

A Rockford man who took a plea deal for sexually assaulting a victim in Crystal Lake has been sentenced to five years in prison, court records show.

Matthew Oppenhagen, 35, of Rockford, was charged in September 2020 with one count of criminal sexual assault, a Class 1 felony.

Court records show the assault occurred on June 16, 2018, in Crystal Lake.

The victim of the assault was unable to give consent, court records show.

The case was investigated by the Crystal Lake Police Department.

Oppenhagen was taken into the custody of the McHenry County Jail in October 2020.

He was later released from the jail after posting 10% of a $30,000 bond and placed on electronic monitoring, court records show.

Oppenhagen recently entered into a negotiated plea deal with the McHenry County State’s Attorney’s Office.

He pleaded guilty Thursday to one count of criminal sexual assault, a Class 1 felony, in exchange for a five-year prison sentence.

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McHenry County Judge Tiffany Davis approved the plea deal and sentenced Oppenhagen to five years in the Illinois Department of Corrections.

Oppenhagen’s sentence will be served at 85% in accordance with truth-in-sentencing guidelines.

He will be required to register as a sex offender for life as part of his conviction.