A Phoenix firefighter pleads not guilty to hit and run charges.
Mark Nehrenz is accused of hitting a teenager who was out rollerblading near 19th Avenue and Union Hills with his vehicle and then leaving the scene.
A witness told FOX 10 a couple of other drivers stopped to help the victim. Another witness called 911, and trailed Nehrenz until police were able to pull him over, authorities say.
Investigators say alcohol was a factor in the crash.
Nehrenz, a 34-year veteran of the department, is on administrative leave.
The teen suffered a broken hip and is recovering.
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