HATTIESBURG, Mississippi -- Former D'Iberville City Manager Michael Janus entered a plea of guilty Monday to one felony count of federal program fraud and will testify at the trial of his now former co-defendant, Scott Walker.

Details of a plea agreement reached between Janus and federal prosecutors were not announced in court, but Janus' attorney, Cliff Johnson, said part of the deal included the dismissal of the other five charges against his client.

U.S. District Court Judge Keith Starrett set sentencing for May 6. He faces a maximum penalty of 10 years in prison and a $250,000 fine.

According to the indictment handed down in November by the U.S. District Court for the Southern District of Mississippi, Janus and Walker "did knowingly embezzle, steal and obtain by fraud" approximately $180,000 from the City of d'Iberville by submitting fraudulent invoices for consulting services by Walker's firm, Maxwell-Walker Consulting.

U.S. Attorney John Dowdy speaks with media following Monday's hearing in U.S. District Court in Hattiesburg.

The fraudulent invoices were supposedly for services based on a $3 million grant awarded to the City of D'Iberville from the Mississippi Department of Environmental Quality.

The initial indictment outlined the case against the two men and federal prosecutors said Monday they were prepared to prove in court the details of the case:

On Dec. 12, 2011, Janus sent an email to someone identified only as "C.B." requesting an invoice for $180,000.

Three days later, Janus asked someone identified as "C.G." to provide him with an invoice for a "finder's fee" for the $3 million grant from the DEQ.

On Dec. 20, Walker submitted a Maxwell-Walker Consulting invoice for $180,000 to the City of D'Iberville.

That same day, Janus submitted a Docket of Claims report to the D'Iberville Mayor and City Council and also on Dec. 20 Janus had a check issued to Maxwell-Walker Consulting.

It is also alleged that Walker paid Janus unspecified amounts of money to curry favor and influence from Janus, who was the D'Iberville City Manager at the time.

Under questioning from Starrett Monday, Janus admitted to conspiring to embezzle $180,000.

John Dowdy, Chief of the Criminal Division for the U.S. Attorney's Office, told assembled media outside the courthouse that Janus is expected to testify at Walker's trial in about a month.

"We expect he will be a witness at that trial," Dowdy said. "He has agreed to testify in that trial pursuant to the plea agreement."

Walker is the son of former Department of Marine Resources Executive Director Bill Walker, who was fired in January amid allegations of misspending and other improprieties during his tenure with the DMR. The elder Walker was also indicted on federal charges, along with former DMR employees Tina Shumate and Joseph Ziegler Jr.

Scott Walker is also a former staffer for U.S. Sen. Trent Lott and a one-time Ocean Springs mayoral candidate.

Dowdy also said the government will seek restitution of the $180,000, either through the forfeiture of cash or the seizure of other property.

"We will seek to get that money back for the city," he said.

U.S. Attorney Jerry Rushing said during the hearing that the plea deal with Janus formalized Monday was the second deal between Janus and prosecutors, but Rushing added the first deal had expired before an agreement was reached.

Later, Dowdy was asked if plea negotiations with Scott Walker were in progress.

"No comment."

Dowdy also declined to comment on the government's sentencing recommendation for Janus, saying it was "under seal." He also would not say whether jail time was included in that recommendation.