Tucker was originally drafted by the Blues in the seventh round (No. 200 overall) of the 2018 NHL Draft.
Tucker, 20, has split this season between the Ontario Hockey League's (OHL) Barrie Colts and Flint Firebirds. Overall, he has posted 55 points (17 goals, 38 assists) and 83 penalty minutes in 52 appearances.
The 6-foot-2, 205-pound defenseman has spent the past four seasons in the OHL, totaling 151 points (35 goals, 116 assists) and 326 penalty minutes in 241 regular-season games.
The Longlac, Ontario native will continue to play with his current team, Flint, for the remainder of their 2019-20 season.