William Hird, 68, pleaded guilty in federal court to conspiracy, wire fraud, mail fraud and making false statements to the FBI, the Philadelphia Inquirer reported Monday.
Hird and his co-conspirators used the court to "give preferential treatment to certain ticket holders, most commonly by fixing tickets for those who were politically and socially connected," prosecutors said in court filings last week.
Hird was a personal assistant to Traffic Court administrative Judge Fortunato Perri Sr., and was later promoted to court administrator and director of records in Perri's court.
Hird is the fourth person to plead guilty in the case in the past year. He faces up to 315 years in prison and fines of up to $4.5 million at his sentencing hearing, scheduled for April.
Perri pleaded guilty in March.