After a four-month investigation, a 20-year-old woman from St. Charles is facing preliminary charges of check forgery, possession of a counterfeit check, and theft by swindle after creating fake payroll checks in the name of a Mankato business.

Mankato Police say an employee of the business, Hannah Jertson, was identified as the woman who faked additional payroll checks made out in her name. According to the criminal complaint, Jertson deposited six such checks, totaling nearly $6,000, through a mobile app on her phone.

Investigators say Jertson claimed she fell victim to a scam, but the signatures on her actual payroll check matched those on the forgeries.