After being fired from his job at Knight Transportation in Katy, Texas, earlier this morning, a gunman returned to the site and shot who is believed to have been his supervisor. Police believe this was a "retaliatory act" and have yet to name the gunman or his victim. One other coworker was injured and the gunman committed suicide shortly after. Police speculate that the worker was disgruntled after being terminated and retrieved the gun shortly after from his home. The investigation is currently ongoing.
See "‘Disgruntled’ ex-employee kills co-worker, himself at Houston-area business after being fired", Mark Berman, Washington Post, May 4, 2016