2nd Death Row Inmate Executed With Nitrogen Gas in Alabama

Officials escort murder suspect Alan Eugene Miller away from the Pelham City Jail in Alabama on Aug. 5, 1999. Dave Martin/AP Photo

Alan Eugene Miller, who was convicted of killing three people in back-to-back workplace shootings, was executed with nitrogen gas at a south Alabama prison on Thursday.

Miller, 59, was pronounced dead at 6:38 p.m. local time.