Simon L. Leis Jr., the hard-charging former sheriff and prosecutor who took on pornographers, go-go clubs and the Robert Mapplethorpe photo exhibit, died Saturday in Cincinnati. He was 92. His family said the cause of death was pneumonia, which followed a years-long battle with cancer. A retired Marine who grew up on Cincinnati's West Side, Leis spent his more than 40 years in public life fighting battles that would burnish the Queen City's conservative reputation for decades.