A company that sold firearms merchandise to the Virginia Tech and Northern Illinois University shooters also sold firearm accessories to a man who fatally shot three women in a Pennsylvania gym earlier this week.
In an exclusive report, CNN's Abbie Boudreau previews new details about the Northern Illinois classroom shooter.
A former student who killed five people at Northern Illinois University last Valentine's Day had been drummed out of the Army for hiding his psychiatric history and expressed admiration for famous murderers, CNN has learned.
Eric Mace says he thought he was giving his daughter good advice by asking her to sit up front in class.
The building where a gunman killed five people at Northern Illinois University two weeks ago will be demolished, state officials said Wednesday.
The revelation from Steven Kazmierczak's girlfriend that he had stopped taking an antidepressant a few weeks before his rampage at Northern Illinois University has reopened debate about whether the drug can cause violent behavior.
The man who killed several students at Northern Illinois University had asked his godfather for help choosing weapons.
Steven Kazmierczak had been taking three drugs prescribed for him by his psychiatrist, the Northern Illinois University gunman's girlfriend told CNN.
Illinois lawmakers moved swiftly with a gun law after Virginia Tech's shooting, but it came too late for Northern Illinois University and it is unclear whether it would have made a difference
This week's deadly shooting at Northern Illinois University leaves police, campus officials and students with many unanswered questions.
I-Reporter Eddie Brewer captures emergency officials rushing a gurney off the Northern Illinois University campus.
The girlfriend of the gunman who killed five people and then himself at Northern Illinois University last Thursday told CNN there was "no indication he was planning something."
CNN's Abbie Boudreau has the exclusive interview with Jessica Baty, who was the NIU shooter's girlfriend for two years.
CNN's Abbie Boudreau asks students and faculty at NIU what they think of the campus security.
A laptop computer seized from a DeKalb motel and believed to be connected to Thursday's deadly shooting at Northern Illinois University had no hard drive, federal officials said Saturday.
Eyewitness: All it took was six minutes for a college lecture course to become a killing field
Northern Illinois University on Friday identified the man who fatally shot five people in a classroom as Steven P. Kazmierczak, whom police described as an award-winning student "revered" by colleagues and faculty.
CNN's Dan Lothian reports on a professor and adviser who knew Kazmierczak well, but saw no red flags.
A firearms dealer in Green Bay, Wisconsin, Friday confirmed a bizarre link between the graduate student accused of killing five people at Northern Illinois University and the gunman in last year's deadly shootings at Virginia Tech.
Police Chief Donald Grady says there is no known motive for the shooting at Northern Illinois University.
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