The girl was 16 years old when she her Charlotte-area home in May 2016.
The FBI says Burns' family have asked for privacy "to focus on their daughter".
According to officials, the Charlotte FBI and Charlotte-Mecklenburg Police Department, who have been handling the disappearance of Hailey Burns since day one, will now be getting help from the Charlotte-Mecklenburg Police Department and FBI Atlanta to bring the case to resolution. Her father, Anthony Burns, said the man "gradually wormed his way into her good graces".
At the time of her disappearance, her family told local media of a diary the teen had left behind that detailed her plan to run away with a man she met online, Fox News reports.