A 41-year-old inmate at the South Dakota Women's Prison in Pierre is scheduled to be sentenced Sept. 25 after being convicted of committing forgery, attempted grand theft and identity theft while behind bars.

Mary Elizabeth Petersen was charged after prison staff members discovered she had forged another person's name and credit card number on mail order forms in 2007. The forms were intercepted before they could be mailed.

Petersen was convicted last week in Pierre.

She's in prison for two unrelated cases: a grand theft conviction out of Davison County and embezzlement convictions in Minnehaha County.