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Three 18-year-olds are facing serious charges after prosecutors say they sexually assaulted a classmate inside a minivan during a high school graduation party. Illinois Suburbia.
Kevin Niemiec of Prospect Heights, Zachary Mascolo of Arlington Heights and John Clary II of Bartlett, all 18, were charged this week, months after the incident that allegedly occurred between the night of June 14 and the morning of June 15.
according to DuPage County Prosecutor, During a graduation party for St. Viator High School students in Roselle, the three were in a minivan with a female classmate when each of them sexually assaulted her.
Authorities said the victim then went to a friend’s house and contacted her sister, who alerted her parents. He was taken to the hospital for medical treatment and they contacted the Roselle Police Department.
“The charges against these defendants are extremely serious,” DuPage County State’s Attorney Robert Berlin said in a news release. “A graduation party is a celebration of accomplishments and excitement for a bright future. It is alleged that Mr. Clary, Mr. Mascolo and Mr. Niemiec abused the victim in the worst way possible and caused lasting harm to a young woman.”
He added, “My sincere hope is that the victim and her family will receive the care they need and deserve to help cope with this horrific incident.” “I commend the victim in this case for her courage and strength in bringing this matter to our attention.”
According to the DuPage County State’s Attorney’s Office, arrest warrants were issued for the three teens on December 17. Mascolo was taken into custody four days later during a traffic stop near his home, authorities said. Clary and Niemiec surrendered at the DuPage County Jail the next day.
Niemiec appeared in court Tuesday, when a judge ordered him detained while awaiting trial. He has been charged with three criminal counts sexual harassment and was denied pretrial release.
Clary and Mascolo appeared earlier in the week and were released under court-ordered conditions that bar them from possessing or consuming alcohol and from having any contact with the victim or his family.
Mascolo is charged with two counts of criminal sexual assault, and Clary is charged with three counts; Both were granted pretrial release with conditions.
Niemiec is set to return to court on January 12, 2026. Mascolo and Clary are scheduled to appear again on January 27, 2026.
in a statement to wgnSt. Viator High School emphasized that the alleged attack did not occur at a school-sponsored event.
“The gathering that gave rise to the alleged criminal conduct took place at a private, non-school-sanctioned event in Roselle that was not sponsored, organized, supervised, or authorized by St. Viator High School,” the school said in a statement. “Despite any reports to the contrary, this event was not at the ‘St. Viator High School Graduation Party.'” In fact, this incident occurred after the high school graduation of the students who were allegedly involved in this crime.
“The safety, well-being and dignity of our students is of the utmost importance to our entire community,” the statement added. “We extend our sincere concern, support and prayers to all those affected by this incident. St. Viator High School will continue to cooperate with law enforcement.”