Joel Johnson Jr., 53, was found fatally stabbed on the porch where he often slept outside Saint Luke’s Mission Center in Glover Park, Washington, D.C., on the evening of Friday, June 19, 2015. Police were called about an unconscious person at about 10:28 p.m.; Johnson had visible stab wounds to the head and neck and was pronounced dead at the scene despite life-saving efforts. His laptop and camera were not taken, and the motive has not been established.

The name Joel Johnson also appears in an unrelated 2012 homicide: on September 19, 2012, a 21-year-old Joel Johnson was found shot inside an apartment in Southeast D.C. after an apparent attempted robbery; that incident is separate from the 2015 killing described above.

Did anyone who knew Joel Jr. or who was in Glover Park that night see something that could help investigators?