Mr. Lieutenant Quarles Harris:
Shot in the head twice while sitting in his car.
Washington Times articles from 2008.
https://www.washingtontimes.com/news/2008/apr/19/key-witness-in-passport-fraud-case-fatally-shot/
https://www.washingtontimes.com/news/2008/nov/01/security-breach-threatens-passport-applicants/
Follow up 2012 story from the Washington Examiner.