But investigators have not yet received the results of Thomas's autopsy.
Police say they tried to pull over 36-year-old Denezious Thomas around 2:00 Tuesday morning.
Thomas crashed his car at the intersection of Jeffries Avenue and Sunny Lane after a short chase.
He reportedly struggled with officers and was tased.
The GBI says autopsy results indicate that Thomas died from ingesting a large amount of cocaine prior to being taken into custody.