March 17, 2016 6:25 pm How Many Officers Are Killed in Traffic-Related Incidents? Traffic-related incidents were the leading cause of death for law enforcement officers in 2015, killing 52 officers nationwide. US & World Videos 1:30 Bruins lose Game 6 in Toronto 4:28 State Department apologizes to family of man imprisoned last year in Turks and Caicos 2:03 Wake held for Billerica police officer hit by excavator last week 2:03 Human remains, including a skull, found in Easton, sources say 1:36 Salisbury shoreline needs help before possible catastrophe, officials say