"We cannot express how much we appreciate the Grady Hospital staff who treated our sergeant," a DeKalb County Police Department statement said. "We ask all to pray for Sergeant Mobley and his family."
Mobley, 44, had stepped out of his patrol car after responding to the accident on the southbound side of Atlanta's downtown connector when he was struck by a passing vehicle.
"Sometimes we get distracted, and distracted driving can cost a life," said DeKalb Police Chief Mirtha Ramos. "And that's what happened today."
Mobley was a "highly-respected supervisor," Ramos said. "He earned that respect."