On a December morning in 2015 Franklin C. Callens, 27, was leaving his Austell, Georgia, apartment for work when he was shot in the chest in the Concepts 21 complex parking lot and later died. The attackers stole his 2013 Toyota Corolla; the vehicle was recovered abandoned in Clayton County.

Investigators tied the killing to a multi-county crime spree that began in the early hours of December 13, 2015. Two teenagers, Christopher Iverson Green, 15, and Cameron Miguel Mathis, 16, had committed multiple carjackings and robberies across metro Atlanta, including a carjacking in DeKalb County and the robbery of a man in Douglasville whose cell phone investigators later tracked to Green’s home. Property from other victims was recovered there.

Both suspects were arrested within hours of the murder. If anyone knew Franklin, saw the attackers, or has information about the Austell parking lot that morning, please share what is known.