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The Blues traded for Mailloux from the Canadiens on Tuesday in exchange for Zachary Bolduc.

Mailloux has one year remaining on his contract before he becomes a restricted free agent in 2026-27. The right-shot blueliner provided two goals and four points in just seven regular-season games with Montreal in 2024-25, and he'll look to earn a full-time role in the bottom four with St. Louis this coming season.

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