This undated booking photo provided by the Arizona Department of Corrections shows James D. Walker. Officials said Walker was armed with a rifle and body armor, opening fire at cars on a highway in the outskirts of Phoenix on Wednesday, May 25, 2016, before police captured him near a stolen car that crashed into a ditch.

Arizona Department of Corrections / AP

This undated booking photo provided by the Arizona Department of Corrections shows James D. Walker. Officials said Walker was armed with a rifle and body armor, opening fire at cars on a highway in the outskirts of Phoenix on Wednesday, May 25, 2016, before police captured him near a stolen car that crashed into a ditch.