Kirk Sampson, an Auburn spokesman, confirmed Saturday that Didion will begin his new job in the compliance office April 22. Didion also worked at Auburn from 1995-99 before leaving for the NCAA.
USA Today first reported the story Friday night.
It's another blow for an enforcement staff already reeling from the loss of two investigators, vice president of enforcement Julie Roe Lach and two other directors of enforcement in 16 months.
The department has come under scrutiny because of an embarrassing scandal in which the NCAA was found to have improperly collected evidence in the case against Miami. It led to Lach's ouster, and forced the NCAA to expunge that material from the case.