Hildeby was reassigned to AHL Toronto on Friday.
Hildeby's demotion comes as Anthony Stolarz (upper body) returns to the crease against Vegas on Friday. With Toronto having a full complement of healthy backstops for the first time this season, the 24-year-old Hildeby was the odd man out, and he figures to spend the rest of the season in the minors -- unless another problem comes up for one of the Leafs' backstops.