Veteran driver Ron Casey of Manchester Center , Vt. , was stricken by an apparent medical emergency .
Veteran driver Ron Casey of Manchester Center , Vt. , was veered off the track before impacting the retaining wall in Turn 2 .
Veteran driver Ron Casey of Manchester Center , Vt. , was stricken by an apparent medical emergency and veered off the track before impacting the retaining wall in Turn 2 .