LeTourneau, then 35 and a married mother of four, was charged with child rape for her relationship with Vili Fualaau, who was in second grade when they met and only 12 when their sexual affair began.
She will be tried alongside Repress, who pleaded not guilty to a charge of failure to report Dufresne's alleged crime.
She was the teen's study hall teacher at Basalt High School, in Basalt, Colo.