Investigators had asked for the public's help with the case after they had conducted dozens of interviews and followed several leads that did not result in an arrest.
New information was found and additional witnesses were interviewed, providing a break the case, the authorities said.
“It is a relief to me that it appears solved,” Robison said. “Nothing will ever bring back that child’s mother, but we look forward to justice being served.”
The slaying was the only homicide in Powder Springs in 2013, Robison said.