sentences:  In 1983 Shepherd became the first driver to win both the NHRA and IHRA Pro Stock championships in the same year, a feat that had never before been achieved; he did it again in 1984.In March 1985, on his way to a fifth straight Pro Stock championship, Shepherd was killed while testing his car in Ardmore, Oklahoma.At the Gatornationals, the next event on the NHRA calendar, the qualifiers in Pro Stock lined up on the track before the start of eliminations in a missing man formation with the pole position being left open for Lee Shepherd.