Anthony Williams pleads not guilty to various charges after passengers were stabbed onboard.
Decarlos Brown Jr., accused of fatally stabbing Ukrainian woman Iryna Zarutska on a Charlotte light-rail train, is deemed incompetent to stand trial.
Federal prosecutors say the Decatur man accused of killing 66-year-old Margaret Swan aboard a MARTA train could face life in prison or the death penalty if convicted.
Trump administration launches federal investigation into Atlanta's MARTA transit system after fatal stabbing of 66-year-old Margaret Swan on a train.