Orlando shooting follows other incidents, including Ft. Hood. But the trend is downward in recent years due to new workplace protections and policies.
Police were able to apprehend the alleged gunman, Jason Rodriguez, a former employee of the engineering firm where Friday's assault left one person dead and 5 injured.
Mr. Rodriguez had been fired by Reynolds Smith & Hills in mid-2007. The investigation into the incident and its possible motivations is ongoing. But after his Friday arrest, he responded to a reporter asking why he did it, saying "They left me to rot."
Ken Jacobson, a top manager and legal counsel at the engineering firm, told CNN that Rodriguez had been terminated after less than a year on the job, after failing to improve his work performance.
"His work was pretty deficient from the start," Mr. Jacobson said. He said the firm had not observed unusual personality traits.
The arrest followed several intense hours during which law enforcement officials from various agencies worked to ensure the safety of workers at the engineering firm and then track down Mr. Rodgriguez. He was found at his mother's home.