BRET MICHAELS Forced To Cancel 'XSport Fitness Rock 'N' Roll Chicago Half-Marathon' Appearance

POISON singer Bret Michaels was forced to cancel his appearance at the XSport Fitness Rock 'N' Roll Chicago Half-Marathon Sunday morning "due to a sudden bout of severe dehydration and the flu."

The XSport Fitness Rock 'N' Roll Chicago Half-Marathon is a fun run that offers live, background music for extra motivation as participants run in support of the American Cancer Society.