Hamilton County's sheriff is defending the decision of one of his deputies to pursue a fleeing car whose 18-year-old driver went on to cause an accident that killed a pedestrian. Sheriff Simon Leis says the death of a 52-year-old woman who had nothing to do with the chase was a tragedy. But the sheriff said today he had reviewed the circumstances of the fatal accident Wednesday and found that his deputy had acted within the department's rules in pursuing a fleeing car. The sheriff said his deputy, 29-year-old Jeff Sabers, did the right thing by trying to stop a fleeing car whose driver was accused of taking off minutes earlier without paying for 16 dollars worth of gas. Officers said the fleeing driver, 18-year-old Vernon Fears of Cincinnati, was charged with aggravated vehicular homicide in the pedestrian's death. Two juveniles riding in the car with Fears were charged with misdemeanor offenses.