A Massachusetts Bay Transportation Authority employee is accused of stealing more than $450,000 from fare collection boxes he was in charge of fixing.

Attorney General Maura Healey's office says 55-year-old Stephen Fagerberg, of Dedham, was indicted Thursday on charges of larceny over $1,200 in a continuous scheme.

When Fagerberg was arrested in June, authorities said he stole more than $80,000 over several months. Prosecutors say a subsequent investigation found he stole more than $450,000.

The MBTA is taking steps to fire the employee and "will work with the attorney general's office to seek restitution," according to agency spokesman Joe Pesaturo.

Fagerberg's lawyer, Sam Higer, declined to comment.

Prosecutors say authorities began investigating Fagerberg in April and planted marked bills in fare collection boxes he serviced. Prosecutors say Fagerberg deposited those marked bills into his personal account.

The MBTA said in June that Fagerberg had been suspended without pay.

With reporting from WBUR's Newscast Unit