Since the start of 2018, at least 33 law enforcement officers across the U.S. have died while on duty -- with 21 of the deaths caused by gunfire.

Roughly 135 cops died in 2016, making it the deadliest year for police officers in at least five years, Fox News has determined. While there were fewer deaths in 2017, the numbers weren’t much better: A total of 129 officers died last year. And 46 of those deaths were caused by gunfire.
http://www.foxnews.com/us/2018/04/25...y-in-2018.html