Lockhart reportedly admitted to authorities that he abducted Burk on campus, robbed her and forced her to take her clothes off before killing her, according to a confession read Monday in an Alabama court.
Lockhart, a veteran of the Iraq War who was discharged from the Army after serving seven months in a military prison for an assault and marijuana court-martial, was arrested after a police chase Friday night. According to an affidavit, Lockhart was in possession of a pistol that was linked to the shooting.
Authorities in Arkansas also made an arrest in the murder of 24-year-old University of Arkansas student Katharine Wood, who was found dead in a bathtub in her apartment Sunday. The chief medical examiner has not made a final determination about how Wood died.
Zachariah Scott Marcyniuk, 28, is being held in an Oklahoma jail as Arkansas police work on his extradition back into Arkansas.
Information from The Associated Press was used in this report.