Derek Johnson, 23, was fatally shot in Chicago on October 30, 2012. He was struck multiple times in a neighborhood that had experienced a string of violent crimes that year; 2012 was a deadly year for the city, which recorded over 500 homicides.

Police responded quickly to the scene, but the motive and full circumstances of Johnson’s killing remained under investigation. His death was one of many that underscored the surge in gun violence the city faced in 2012 and the ongoing challenge for residents and authorities.

If anyone knew Derek, saw activity in that neighborhood on October 30, 2012, or has information about this shooting, please come forward.