Perry Thompson, 45, was shot and killed on June 3, 2012, in Philadelphia. The slaying occurred on a block long associated with criminal activity during a year when the city was experiencing rising homicide rates and worsening gun violence.

Thompson’s killing remains unsolved and no arrests have been announced. Police are asking anyone with information to come forward to help solve the case.

Did anyone who lived on or near that block in 2012 see or hear anything that could help investigators?