(Yuba-Sutter, CA) — Federal officials announced that a 58-year-old Washington state woman pleaded guilty Thursday to a multiyear scheme involving a Sutter County business that netted her more than $900,000.

According to The Appeal-Democrat, the U.S Attorney’s office says Tamara Mannisto of Ocean Park, Washington, pleaded guilty to one count of bank fraud after an investigation by the IRS. Court documents show that from February 2007 through November 2016, Mannisto worked for a “mechanical food processing and farming” company located in Rio Oso. Officials said the name of the company could not be released because it is considered a victim. As part of her role with the Sutter County company, Mannisto prepared checks for the owners to sign. Officials said around the beginning of January 2012 and through October 2016, Mannisto carried out a fraudulent scheme to steal over $900,000 from her employer. As part of the scheme, Mannisto created company checks and made them payable to herself, without authorization and for amounts not due her.

Manisto is scheduled to be sentenced in March of next year, Federal officials said she faces up to 30 years in prison and a $1 million fine.