Two former Massachusetts State Police troopers stationed in Framingham were convicted in relation to actions they took to cover up their part in the overtime scandal.

A federal jury in Worcester on Tuesday convicted Lt. Daniel Griffin, of Belmont, and Sgt. William Robertson, of Westboro, on one count each of conspiracy, one count each of theft concerning a federal program and four counts each of wire fraud.

Just before the Worcester trial commenced, Griffin on Nov. 27 pleaded guilty to four additional counts of wire fraud and 11 counts of filing false tax returns.

Both men are facing serious prison time, with a charge of wire fraud alone providing a sentence of up to 20 years in prison. U.S. District Court Judge Margaret R. Guzman scheduled sentencing for March 20.

The troopers were stationed at the Traffic Programs Section at State Police headquarters in Framingham.

According to the indictment filed December 2020, the pair “and their coconspirators would purposely arrive late to, and leave early from … Overtime shifts on a regular basis.” The scheme, which dated back to 2015, included having the whole crew register the same false hours worked at their pay stations.

When the scheme to defraud the state of massive amounts of money to pay overtime they didn’t actually work, Griffin and Robertson worked to cover up their deeds by shredding key records and forms, the indictment states.

Then, in July 2019 an internal memo circulated in the MSP regarding missing forms — the same type of form that the conspirators had shredded — and Griffin submitted a memo to his superiors “that was designed to mislead them by claiming that missing SP-637 forms were ‘inadvertently discarded or misplaced’ during office moves,” the indictment states.

Griffin’s additional charges to which he pleaded guilty in November are related to him spending a significant amount of time he was on the public dime as an MSP lieutenant — collecting regular pay as well as fraudulent overtime — actually running his security business, Knight Protection Services, according to the indictment. From 2012 to 2019, Griffin collected nearly $2 million in revenue from his business but hid more than $700,000 of that from the IRS.

He also defrauded a private school attended by two of his children by obtaining more than $175,000 in financial aid by hiding his Knight Protection Services income and filing misleading applications.