Dr. James Comazzi

Dr. James Leonard Comazzi booking photo.

A cardiologist from Sonora pleaded not guilty Thursday to hit-and-run and vehicular homicide involving the death of a 26-year-old good Samaritan on Highway 99.

James Comazzi, 68, is accused of hitting and killing Juliana Ramos of Reedley on Feb. 10 as she stopped and helped the victim of an accident on northbound Highway 99 near the Manning Avenue exit in Fresno County.

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