The officer was answering a call for a suspicious vehicle, police said.
ref:https://www.washingtonpost.com/local/public-safety/baltimore-county-police-officer-killed-in-line-of-duty-shooter-remains-at-large/2018/05/21/3df1f24c-5d31-11e8-9ee3-49d6d4814c4c_story.html
