A state Highway Patrol trooper pulled Anderson Hazelwood over. Officials said Hazelwood taunted the trooper, then sped off.
A chase topped speeds of 100 mph before Hazelwood crashed on Leesville Road.
Shavonda Commissiong, 26, and her son, Jalien, 5, died at the scene.
Investigators said Hazelwood did not have a driver's license and there was marijuana in the car.
Other charges are pending.
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