The D.C. charter schools scandal took a new twist with the revelation that an employee of charter schools executive Brenda Belton altered a memo directing the schools finance office to pay questionable contractors.

Mary Bunn admitted to her supervisors Friday and to The Examiner on Monday that she cut and pasted Board of Education Vice President Carolyn Graham’s signature on a May 17 memo to Abinet Belachew, comptroller of the schools’ finance office.