Their bodies were found around 6:45 p.m. Thursday in a grassy area beside the sidewalk, near Calvary Baptist Church in Lilburn.
Lilburn police say the driver of the pickup tried passing another vehicle and lost control of the truck. Authorities say the driver fled the scene but was later arrested.
Capt. Thomas Bardugon says the driver is expected to face charges. The suspect’s name and the names of the victims have not been released.
Lilburn is about 20 miles northeast of downtown Atlanta.