Parma -- The city has disciplined a police commander found guilty of disorderly conduct in Geauga County after being accused of sucker-punching a teen driver in a burst of road rage last fall.

Lt. Kim Cornachio received three "penalty days" as punishment. He lost one paid holiday and has been order to work two of his off days, according to Parma Detective Marty Compton. An internal investigation and hearing determined that Cornachio violated Police Department rules in the off-duty incident in November 2008.

Cornachio could not be reached for comment.

A 17-year-old driver told Geauga sheriff's investigators that Cornachio slugged him in the side of the head as he sat in his stopped car, leaving him with a black eye.

Bob Zahn, who was a Kenston High School senior at the time, said the encounter took place after Cornachio passed his slow-moving car on Auburn Township's Taylor May Road and then blocked the street with his SUV.

Cornachio, 56, of Auburn, denied striking Zahn but admitted to stopping the teen in the roadway. The police veteran said he took action because he witnessed Zahn driving erratically.

Prosecutors charged Cornachio with disorderly conduct. A Chardon Municipal Court judge fined him the maximum $150 after a plea of no contest in April.

Zahn's mother, Gina, accused Prosecutor Jim Gillette of minimizing the altercation and said she wanted Cornachio charged with assault. On Friday, she said she was pleased Parma reprimanded Cornachio to acknowledge the wrongdoing. She said the officer deserves to have the black mark on his personnel record.