A gunman fired on the July Fourth festivities from a rooftop in Highland Park with a high-powered rifle, killing at least seven people and wounding dozens of.
Lake County State's Attorney Eric Rinehart says he expects dozens more charges to be filed against the suspect. Here's what else we know as of midday Tuesday.
The suspected shooter is also believed to have acted alone, and authorities found a second weapon in his car. Here's what else we know as of midday Tuesday.