A former lieutenant in the Massachusetts State Police was indicted Wednesday for collecting more than $12,000 in overtime pay for shifts he did not work as part of the ongoing investigation into overtime abuses at the law enforcement agency.

Former Lt. David Wilson, 57, of Charlton, was indicted in federal court on one charge of embezzlement from an agency receiving federal funds. He had previously been arrested and charged by a criminal complaint on June 27.

Wilson was a member of the State Police's Troop E enforcing traffic laws along the Massachusetts Turnpike, and served as the officer-in-charge of several overtime shifts, according to the U.S. Attorney's office.

Troopers also patrol state property in Hull, such as the Nantasket Reservation and Fort Revere. 

In 2016, Wilson earned approximately $230,000 and worked 170 overtime shifts for the Accident and Injury Reduction Effort program, which targeted vehicles speeding on the turnpike, according to the indictment.

Prosecutors allege that Wilson took home $12,450 for overtime shifts he either didn't work, or left early, concealing the fraud by submitting citations that were either never issued or were issued during hours outside the overtime shifts.

No date for Wilson's arraignment has been scheduled. Six troopers thus far have been charged by the U.S. Attorney in connection with the overtime abuse scandal. Trooper Gregory Raftery, 47, of Westwood, has already pleaded guilty, and suspended Trooper Kevin Sweeney, 40, of Braintree, has agreed to plead guilty, U.S. Attorney Andrew Lelling's office said.