An Alabama man convicted of sending mail bombs during a wave of Southern terror has been executed for killing a federal judge, becoming the oldest prisoner put to death in the U.S. in modern times.

Walter Leroy Moody Jr., 83, was pronounced dead at 8:42 p.m. following an injection at the Alabama prison at Atmore. He had no last statement and did not respond when an official asked if he had any last words shortly before the chemicals began flowing.