A 47-year-old California man pleaded guilty Monday to charges of threatening Sen. Barbara Boxer (D-Calif.), the Marin Independent Journal reported.

Kevin Joseph O’Connell was arrested near his San Rafael home in July on the suspicion that he made threats against the California Democrat in a voice mail that he left at her San Francisco office.

Deputy District Attorney Aicha Mievis announced that O’Connell admitted to charges of criminal threats and threatening a public official, the Marin Independent Journal reported.

Under the terms of the plea deal, the charges were reduced from felonies to misdemeanors. He could have served up to three years in prison under the harsher charges, but he now faces up to a year in prison. O’Connell is expected to be sentenced Nov. 9.

The news comes as the Capitol Police and FBI investigate other threats against Congressional lawmakers.

Rep. Bobby Schilling (R-Ill.) was told to take precautions after receiving an email alert last week stating that an individual “will pay $75,000 for ASSASSINATING Illinois Congresswoman [sic] Bobby Schilling.”

Capitol Police were also looking into a similar threat against Rep. Mike Pence (R-Ind.), spokeswoman Sgt. Kimberly Schneider confirmed.