U.S. Attorney Andrew E. Lelling said he can’t yet commit to an “end point” in the state police overtime investigation the same day that two more retired state troopers agreed to plead guilty, another pleaded guilty and a new trooper was charged in connection with the scandal.

“The fact that we’re still doing this is an indicator of our view of the scope of the problem,” Lelling said. “It appears necessary from what we’ve seen so far to clean house a little bit at the state police, so we are going to keep investigating the use of overtime while we have leads.”

Suspended trooper Eric Chin, 46, of Hanover, pleaded guilty Wednesday just before trooper Heath McAuliffe, 40, of Hopkinton, walked into another courtroom in handcuffs for his initial appearance. Former state police lieutenant David Wilson, 58, of Charlton, and retired state trooper Daren DeJong, 57, of Uxbridge both agreed to plead guilty Wednesday as well. All are charged with embezzlement from an agency receiving federal funds.

McAuliffe was suspended without pay in March, state police spokesman Dave Procopio confirmed, but his attorney, James Sultan, said in court yesterday that McAuliffe suffered a shoulder injury in March on the job, had surgery in June and has been collecting disability since.

McAuliffe made $156,647 in 2017, according to state payroll records. He was paid $164,680 in 2016, including approximately $60,908 in overtime, and earned $180,215 in 2015, including approximately $83,496 in overtime. According to court documents, between Aug. 1, 2015, and Aug. 31, 2016, McAuliffe was paid $9,825 for Accident and Injury Reduction Effort program (AIRE) overtime hours that he did not work.

Wilson and DeJong both agreed to plead guilty after being arrested and charged over the summer. A date for the plea hearings has not been scheduled.

Wilson was paid approximately $259,475 in 2016, which included approximately $102,062 in overtime pay. Wilson has agreed to plead guilty to having been paid $12,450 for fraudulent overtime. DeJong was paid $200,416 in 2016, which included approximately $68,394 in overtime pay. DeJong has agreed to plead guilty to having been paid $14,062.50 for falsified overtime.

Prosecutors are recommending that both Wilson and DeJong spend six to 12 months behind bars.

Chin admitted collecting $7,125 for overtime hours that he did not work, involving the AIRE program. In 2016, Chin earned $302,400, which included approximately $131,653 in overtime pay.

Chin faces six to 12 months behind bars, having to pay back the $7,125 in overtime and 12 months supervision. He will be back in court for sentencing on March 20.

“It’s an unfortunate day for trooper Chin, who had a strong, proud career in state police,” his attorney, Douglas Louison, said. “He is here to accept responsibility and move on from it. It was a systemic problem within the state police and he was unfortunately caught up in that.”

The latest developments in the overtime abuse scandal brings the total number of Troop E members who have pleaded guilty or agreed to do so to seven. Chin is the fifth Trooper to plead guilty as a result of the ongoing investigation. McAuliffe is the eighth state police trooper charged in the ongoing investigation.

Troop E, which has since been disbanded, was responsible for enforcing criminal and traffic regulations along the Massachusetts Turnpike.

“Colonel Gilpin and her Command Staff continue to implement operational and oversight reforms, and will continue to share overtime audit results with state and federal prosecutors to hold accountable department members who fail to uphold the code of integrity, honesty, and professionalism we demand,” Procopio said.