David W. Flynn, 57, of Chicago.

A man has been sentenced to 15 years in prison for sexually assaulting a child family member on multiple occasions in McHenry County over the span of years.

David W. Flynn, 57, of Chicago, was charged in March 2022 with numerous counts of criminal sexual assault of a child, aggravated criminal sexual abuse of a child and sexual relations within families.

A criminal complaint filed by a Marengo police detective said Flynn sexually assaulted a family member, who was under the age of 18, multiple times between October 2015 and May 2019.

Another assault occurred in January 2022, the complaint said.

A second criminal complaint filed by a Fox River Grove police officer alleged Flynn illegally engaged in sexual relations with the family member between September 2021 and January 2022.

A third criminal complaint filed by a McHenry County sheriff’s detective alleged Flynn sexually assaulted the child family member between April 2020 and August 2020.

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Court records show Flynn pleaded guilty on Friday to three counts of sexual relations within families, a Class 3 felony, in exchange for the rest of his charges being dismissed.

McHenry County Judge Tiffany Davis approved the plea deal.

She sentenced Flynn to five years in the Illinois Department of Corrections (IDOC) for each count pursuant to the agreement.

The sentences will be served consecutively and at 50%, court records show.