Kevin Niemiec, Zachary Mascolo, Jon Clary II accused of sexually assaulting female classmate at Roselle St. Viator HS party

In Roselle, Illinois, three teenagers are facing serious accusations after allegedly sexually assaulting a female classmate during a graduation celebration at a suburban high school. This information was released by the DuPage County State’s Attorney’s Office on Tuesday.

Kevin Niemiec, an 18-year-old from Prospect Heights, has been formally charged with criminal sexual assault. He currently remains in custody as he awaits trial, according to the state’s attorney’s office.

ABC7 Chicago is now streaming 24/7. Click here to watch

Also charged with criminal sexual assault is Zachary Mascolo, another 18-year-old, from Arlington Heights. Unlike Niemiec, Mascolo has not been detained and is not in custody at this time.

The third individual, Jon Clary II, also 18, hails from Bartlett. He appeared in court on Tuesday but, similar to Mascolo, is not being held in custody.

Under their pre-trial release conditions, both Mascolo and Clary are prohibited from consuming or possessing alcohol and must avoid any contact with the victim and her family, as directed by officials.

The incident came to light when Roselle police received a report on June 15 about an alleged sexual assault that took place the previous night at a Saint Viator High School graduation party in Roselle.

Officials said the defendants and the victim were in a minivan, where each of the teens sexually assaulted the victim.

The victim was taken to a local hospital after the incident.

Judge Michael Burton issued an arrest warrant for all three defendants on Dec. 17.

Mascolo was taken into custody Sunday, while driving near his home.

Clary and Niemiec turned themselves in to the DuPage County Jail on Monday.

“The allegations levied against these defendants are extremely serious,” DuPage County State’s Attorney Robert Berlin said. “A graduation party is a celebration of accomplishments and the excitement of a bright future. It is alleged that Mr. Clary, Mr. Mascolo and Mr. Niemiec violated the victim in the worst possible way and inflicted a lasting harm on a young woman. It is my sincerest hope that the victim and her family receive the care they require and deserve to help them cope with this horrific event. I commend the victim in this case for her courage and strength in bringing this matter to our attention.”

Niemiec is next due in court Jan. 12. Mascolo and Clary are due in court Jan. 27.

Saint Viator High School said in a statement:

“We were deeply saddened to learn today that criminal charges were filed against three St. Viator alumni involving another graduate of our School. These allegations-which come during the Christmas season-involve serious and troubling conduct which was reported over the summer in connection with an offsite private graduation party from this past June.

“This gathering which gave rise to the alleged criminal conduct took place in Roselle at a private, non-school-sanctioned event that was not sponsored, organized, supervised, or authorized by Saint Viator High School. Despite any reports to the contrary, this event was not at a “Saint Viator High School graduation party.” In fact, the event took place after the students who were allegedly involved in this crime graduated from high school.

“The safety, well-being, and dignity of our students are of utmost importance to our entire community. Saint Viator High School remains committed to fostering a culture of respect, responsibility, and care consistent with our Viatorian mission and values.

“We extend our sincere concern, support, and prayers to all those affected by this incident. Saint Viator High School will continue to cooperate with law enforcement. Because this matter involves ongoing legal proceedings, the School is unable to comment further at this time.”

You May Also Like
Southwest jet struck by ground equipment vehicle at Memphis airport

Southwest Flight Struck by Ground Vehicle on Memphis Airport Tarmac

A Southwest Airlines aircraft was hit by a ground service vehicle while…

WHCD Shooting Suspect Cole Allen Loses Fight to Remove Top Prosecutors from Case

A federal judge on Monday declined to disqualify Acting Attorney General Todd…
Serena Williams returns to singles tennis at Wimbledon after accepting wild card invitation

Serena Williams to Make Singles Tennis Comeback at Wimbledon on Wild Card

June 21, 2026 / 3:52 PM EDT / AP Serena Williams is…
Iran's unprecedented 'whole-regime' delegation at US deal talks signals one goal: expert

Iran’s Unprecedented Full-Regime Delegation to U.S. Talks Signals a Singular Aim, Expert Says

The size and makeup of Iran’s delegation at Switzerland’s first round of…
Family of California woman Ashley Phillips who went missing in Costa Rica shares tragic update

Family of California Woman Missing in Costa Rica Shares Tragic Update on Ashley Phillips

Authorities have confirmed that a body recovered in a remote part of…

Top Latino Leaders Endorse Adriano Espaillat Over Chevalier in Contentious NYC House Race

A notable bloc of Latino elected officials in New York City released…
Los Angeles chokes on toxic smoke from massive warehouse fire as Spencer Pratt blames Karen Bass

Toxic Smoke Blankets Los Angeles After Massive Warehouse Fire as Spencer Pratt Faults Mayor Karen Bass

Emergency crews are working urgently to prevent a possible biohazard crisis after…
Revealed the mysterious blonde behind Trump's cryptic post

Mysterious Blonde in Trump’s Cryptic Post Identified

President Trump stirred a wave of online speculation late Saturday after sharing…
Georgia pair charged with murder after bartender's dismembered remains found in lake outside Atlanta

Georgia Pair Charged With Murder After Bartender’s Dismembered Remains Found in Lake Near Atlanta

Two Georgia residents have been charged with murder after authorities said a…
Adorable doggy fashion show 'Dare to Strut' takes Los Angeles by storm

Los Angeles Dogs Hit the Runway at Adorable Dare to Strut Fashion Show

Paws up! The stars arrived, strutted their stuff, and stole the spotlight…
NYPD officer struck by suspect fleeing in stolen car, leading fellow cop to shoot driver

NYPD Officer Struck by Suspect Fleeing in Stolen Car; Fellow Officer Shoots Driver

An NYPD sergeant was struck by a stolen vehicle during a chase…
One-armed Gambino mobster behind $1.7 million Chanel heist: DA

Prosecutors Say One-Armed Gambino Mobster Orchestrated $1.7 Million Chanel Heist

Thomas “Tommy” Dono, a relatively obscure one-armed Gambino crime family soldier who…