Six months after he was fired, a 36-year-old man cornered former co-workers in the Chicago auto parts warehouse where he had worked, killing six of the company's nine employees, including two of its owners, on August 27.

Using a .380-caliber semiautomatic handgun, the man traded gunfire with Chicago police inside and outside of the Windy City Core Supply warehouse before being killed by a police bullet. There is a ban on handguns in Chicago.

Police said the man had made threatening phone calls to the company's owners since his firing for poor attendance and causing trouble at work, but no police reports were filed. The man had been arrested a dozen times over 14 years, mostly for menacing his girlfriend and family with a handgun, according to press reports.

The president of the auto parts supplier narrowly missed the shooting, arriving late for work after dropping off his daughter at high school.

In the past 15 years, there have been at least 115 job-related shootings in which an employee or former employee killed or injured a co-worker with a gun, according to Handgun-Free America. There have been five fatal incidents this summer.