Adarius Hayes, 21, was found shot to death in a car on August 5, 2015, in the 7500 block of South Damen Avenue in Chicago’s Auburn Gresham neighborhood. Hayes was identified as a member of the Killer Ward Gangster Disciples, and police say his chest wound set off an intensifying feud between the Killer Wards and the Bang Bang Gang, a faction of Terror Dome tied to the Black P Stones.

That killing is described as the first in a string of violent incidents that later included the murder of nine-year-old Tyshawn Lee and other shootings. Chicago Police identified Pierre Stokes and his relative Christopher Smith as documented Killer Ward members; neither cooperated with investigators. Police executed a search at Smith’s home after Hayes’ death but filed no charges. A video later posted then removed from social media showed Stokes, Smith, and others beating a young man they accused of Bang Bang affiliation.

The cycle of retaliatory violence continued that autumn, including the October 13, 2015, murder of Tracey Morgan, whose mother was wounded. Many questions remain about who pulled the trigger in Hayes’ slaying and the subsequent revenge attacks. Does anyone have information about Hayes, the August 5 location, or the people seen in the beating video?