Matthew Mason, 26, an African American man, was shot and killed on July 14, 2019, in the South Chicago neighborhood. He and 31-year-old Maurice Jackson were found in the 8500 block of South Escanaba with multiple gunshot wounds; both deaths were ruled homicides.

Witnesses said a dark-colored vehicle sped away from the scene after the gunfire, and investigators determined the attack was a drive-by shooting. Several witnesses were reluctant to cooperate because of fear of retaliation, which investigators reported hampered the early stages of the probe and left questions unresolved.

The Chicago Police Department questioned multiple people as its investigation went forward. Did anyone in the South Chicago area at the time see the dark-colored vehicle or other details that could help clarify what happened?