Will County Coroner Laurie Summers said Holly Matthews and Jonathan Ceballos, both 22 and Joliet residents were fatally shot early Sunday at the party in the city about 45 miles southwest of Chicago.

"We will do what it takes, individually and collectively, to address the immediate violence on our streets and invest in fighting the underlying causes that cause too much despair, too much addiction, too little mental health treatment and too few opportunities,” Gov. J.B. Pritzker said Monday.

Those killed included a 22-year-old woman and two men who were fatally shot in separate incidents on Halloween, the Chicago Police Department announced.

Mauricio Ramirez, 32, was ordered held on $500,000 bail Thursday after he was charged with criminal sexual assault to a victim between the ages of 13-17 and aggravated criminal sexual abuse of a victim under 18.

Public safety apps like Citizen and Nextdoor allow users to report incidents and crime in the area. But some skeptics say these apps have fueled fear.

Francis Wayne Alexander would have been 21 or 22 years old when Gacy killed him sometime between early 1976 and early 1977, Cook County Sheriff Tom Dart said at a news conference in announcing the identification of Alexander’s remains.

Milixen Ardon, 24, and Wilfredo Cruz, 43, were each held without bail following their arrests on charges of first-degree murder in the death of Ardon’s 2-year-old daughter Alison Zerais Ardon.

Political corruption. Gun violence. Financial crimes. Homegrown terrorism. These are just a selection of the cases brought in the last four years by John Lausch, U.S. Attorney for the Northern District of Illinois.

Thomas Osadzinski, 22, designed a computer code to help the Islamic State bypass programs designed to block the group's propaganda, prosecutors said.

Data published Monday morning by the CPD shows there were 21 separate shooting incidents throughout the city during that time, and 22 total people were struck.

In March, a task force was formed by the Chicago Police Department, the Cook County Sheriff’s Office, the Illinois State Police, and others to try and put the brakes on carjackings.

Federal prosecutors announced charges against five reputed members of the O-Block street gang, accusing them of participating in a criminal organization responsible for murder and of “violently” protecting the gang and its territories on the South Side.

A mass shooting in Wicker Park that left one person dead and four others wounded Sunday morning was among 31 shooting incidents over the holiday weekend, according to the Chicago Police Department.

Louis Capriotti, 46, entered a guilty plea Thursday, court records indicate, admitting to leaving what a federal judge had previously described as “very explicit and concerning” voicemails.

Kim Foxx held a rare press conference Tuesday to respond to Mayor Lori Lightfoot, calling it “inappropriate” and “wrong” for the mayor to publicly push for criminal charges in last Friday's shooting “without the benefit of all of the evidence.”

Michael Aguirre was held without bail during a court hearing Wednesday following his arrest this week on a charge of first-degree murder stemming from the killing of 14-year-old Savanah Quintero.