AUBURN, Ala. — The man accused of killing an Auburn University student in March has been indicted on three capital murder charges.

Courtney Lockhart was also indicted on a charge of robbing a business in his Smiths Station hometown.

The Auburn student, 18-year-old Lauren Burk, was killed on March 4. She was found lying in the roadway on Alabama Highway 147 and died of a gunshot wound at a local hospital.

The 23-year-old Lockhart was arrested three days later. Authorities say he told police he abducted Burk from the Auburn campus, then robbed her and forced her to remove her clothes before shooting her.

Lockhart's attorneys say they are preparing an insanity defense.