Sean Dillard was 46 when he was found unconscious and unresponsive on the morning of Friday, December 4, 2015, in the 5200 block of C Street Southeast in Washington, D.C. Emergency services arrived about 10:17 a.m., but Dillard had sustained fatal gunshot wounds and was pronounced dead.

The Metropolitan Police Department opened a homicide investigation and asked the public for information about the shooting.

Does anyone who lived or worked in that neighborhood in December 2015 remember seeing anything or know anything that could help investigators?