The owner of a Washington state manufacturing company has pleaded guilty to federal fraud charges, the fourth person to admit to a role in a bribery and kickback scheme involving military aircraft parts sold to The Boeing Company.

Jeffrey Lavelle, owner of J.L. Manufacturing of Everett, Washington, pleaded guilty Monday in U.S. District Court in St. Louis to mail and wire fraud. Sentencing is Oct. 27.

Former Boeing procurement officer Deon Anderson pleaded guilty earlier this month, admitting he took bribes from companies seeking to sell parts for military aircraft in exchange for providing them with confidential information such as competitor bids. Another contractor and a consulting firm owner have also pleaded guilty and are awaiting sentencing.