JANESVILLE — A 26-year-old Beloit man was sentenced Friday to 57 years in prison, followed by another 30 years of extended supervisions, for the sexual assaults of two underage girls.
The charges against Isaiah Washington, filed as two separate cases in May 2024 and May 2025 in Rock County Circuit Court, included two counts of second degree sexual assault of a child and one count of first-degree sexual assault of a child under the age of 13. Washington was found guilty on all of the charges by a jury trial in December 2025.
According to a criminal complaint, Washington was arrested in 2024 for assaulting a 13-year-old in the back of a car, and then sexually assaulting her in the bathroom of an apartment in Janesville. She reported the assault the next day. In late 2024, after Washington had been arrested and was in custody at the Rock County Jail, another underage girl reported that he had assaulted her at a house in Beloit when she was 11 years old.
Isaiah Washington
According to online court records, Washington has an adult criminal history dating back nearly a decade, including felony convictions for theft, burglary, bail jumping, fleeing an officer and battery by a prisoner, as well as a variety of misdemeanor convictions and municipal citations.
He’s currently facing felony charges of battery by a prisoner as a repeat offender and as a party to a crime, filed in Rock County in February 2025, and battery by prisoners, filed in October 2025. His next court appearance on all of these charges is scheduled for March 31.
And he’s facing a felony charge of possession of a firearm as a convicted felon, filed in Rock County in August 2024. His next court appearance on this case is also scheduled for March 31.
