Lockhart was arrested by Phenix City police at a traffic stop and later charged with three capital counts accusing him of murder along with kidnapping, robbery and attempted rape, Dawson said.
Burk was found shot on the side of a road about 5 miles from campus Tuesday night. She died later a hospital. Her car was found that night burning in a campus parking lot.
The charges indicate Burk was abducted at random, but it was not immediately clear where she was attacked or when she was shot.
Forensic reports found that Burk had not been sexually assaulted, Auburn police said.
Burk was arrested in Phenix City on robbery charges, apparently unrelated to the Burk case, and held in the Russell County Jail on $250,000 bond.