U.S. Air Force pilot Patrick Burke’s day started in the cockpit of a B-1B bomber near the Persian Gulf and proceeded across nine time zones as he ferried the aircraft home to South Dakota.

Every four hours during the 19-hour flight, Burke swallowed a tablet of Dexedrine, the prescribed amphetamine known as “go pills.” After landing, he went out for dinner and drinks with a fellow crewman. They were driving back to Ellsworth Air Force Base when Burke began striking his friend in the head.