Diamond Rashaun Garner, 23, was shot to death in Chicago on February 23, 2016. He was found with multiple gunshot wounds after an altercation that witnesses said escalated into gunfire; bystanders heard shots and saw people fleeing. Police recovered shell casings and other physical evidence at the scene.

Investigators identified several suspects and questioned them. A 25-year-old African American man who reportedly had a prior dispute with Garner was charged with first-degree murder after prosecutors said forensic evidence, eyewitness accounts and surveillance footage linked him to the scene. At the Cook County trial the defense argued self-defense, but a jury convicted the defendant of first-degree murder and imposed a lengthy prison sentence.

Garner’s death prompted local discussion about gun violence and community conditions. If anyone knew Diamond or witnessed the shooting, does new information exist that could add clarity to what happened that night?