A late-July barbecue in Atlanta’s Empire Park ended in mass violence when a barrage of gunfire left 18-year-old Deshawn Johnson dead and five others wounded. Investigators say more than 100 rounds were fired, and detectives treated three linked scenes: the park, a nearby apartment complex where victims were found, and a car that was pulled over not far from the park.

Police released surveillance video showing a dark-colored sedan arriving at the park and a tall male exiting the passenger side; authorities believe that man is the primary suspect. A $10,000 reward was offered for information leading to an arrest and conviction, but no arrests had been announced.

The motive remains unclear and the identities of the tall passenger and the sedan’s driver have not been made public. If anyone was at Empire Park that night or has information about the vehicle or the man seen on the footage, can you help investigators by coming forward?