In that incident , a car hit two tractor tires , sending it airborne and striking two spectators , a 68-year-old man and a 14-year-old boy . 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 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 .