NEW : NASCAR says Jason Keller had just returned to dirt - track racing . He died Wednesday in a crash at a New Jersey dirt track . NASCAR calls Leffler a ` ` fierce competitor '' who will be missed . ` ` Lost a good guy tonight , '' racer Bobby Hamilton tweets .
NEW : NASCAR veteran Jason Leffler had just returned to dirt-track racing . He died Wednesday in a crash at a New Jersey dirt track . NASCAR calls Leffler a `` fierce competitor '' who will be missed . `` Lost a good guy tonight , '' racer Bobby Labonte tweets .