Hugh McQuaid file photo
Federal prosecutors do not plan to charge former House Speaker Chris Donovan in the 2012 campaign corruption case that dashed his congressional candidacy and has two of his former staffers serving prison terms.

Donovan’s lawyer was notified Friday that the U.S. Attorney’s Office had closed its investigation into a conspiracy to illegally donate $27,500 to Donovan’s congressional campaign. All but one of the seven men found guilty on related charges have been sentenced to prison terms.

“Please be advised that the investigation is now closed and, based on information and evidence currently available to the Government, this Office will not seek to charge your client with violations of federal criminal law in connection with that investigation,” U.S. Attorney Deidre Daly said in a letter to attorney Shelley R. Sadin.

Donovan issued a short statement through his friend and spokeswoman, Audrey Honig Geragosian.

“The investigation is over. I look forward to continuing my efforts to advocate for a fair and just society,” he said.

Prosecutors hinted in court documents that Donovan was aware of the conspiracy, but Donovan was never charged and he maintained that he knew nothing of the scheme.