UPDATE: An earlier version of this post misspelled the first name of Assistant U.S. Attorney Bryan Seeley of the District’s U.S. Attorney’s Office.

A Sterling man accused of being a key player in a $20 million contracting scam at the Army Corps of Engineers is expected to plead guilty next week to paying bribes and kickbacks, federal prosecutors revealed in a court filing Wednesday.

Harold F. Babb, 60, was one of four men — including two Army Corps employees — who were arrested in October on charges of conspiring to commit bribery and wire fraud. They were accused of inflating $25 million in invoices by $20 million over a four-year period and then collecting the proceeds.

Babb was the contracting director for Eyak Technology, a company that administered one of the contracts targeted in the scheme, prosecutors say.

“We have reached a tentative agreement,” Babb’s attorney Jeffrey Jacobovitz said shortly after prosecutors filed the papers. “We are still working out some of the details.”

Babb, who is scheduled to appear before U.S. District Judge Emmet G. Sullivan on March 13, is the second person to plead guilty in the case. Last month, Michael Alexander, 55, a former Army Corps program manager, pleaded guilty to money-laundering and bribery charges. He faces at least nine years in prison under federal sentencing guidelines.

In court papers, Assistant U.S. Attorneys Michael Atkinson and Bryan Seeley wrote that they were discussing potential plea deals with attorneys for the two other men charged in the case: Kerry Khan, a former Army Corps program manager, and Khan’s son, Lee.

The prosecutors asked Sullivan to delay a hearing next week in the Khans’ cases to “permit the parties to continue their attempts to negotiate pre-trial dispositions of these matters.”

Read more: The Post’s crime coverage