Issac Harper, a 21-year-old African American man, was shot and killed on September 19, 2017, in the Longwood Manor area of Chicago. He was sitting with his twin sister on the back porch of a home on Green Street near 97th when three bullets struck him; he was pronounced dead at the scene. An aunt who is a Chicago police officer was on duty in a neighboring district, heard the address over the scanner, and arrived to find her nephew had been fatally shot.

Harper was taking online classes toward a college degree and working as a stock clerk for Amazon. Family members described him as a good kid, and his twin sister and other relatives were left devastated. There were no immediate arrests or identified suspects in the aftermath, and the investigation reported few public updates.

Does anyone who lived in or around Longwood Manor in September 2017 remember seeing or hearing anything that could help investigators?