Pleau was to be honored Monday night during a dinner with the current managers.
"It's going to be a really good night tonight," said Doug Armstrong, the current GM with the Blues. "There will be a few laughs and probably a few tears too."
During his time as the manager of the Blues, the team posted a 468-396-120 record and captured the Presidents' Trophy in 1999-2000. From 1997-2003, the Blues went 260-153-63-16, the best six-year run in franchise history.
Pleau also was a primary builder of the success the team is enjoying today. He had a hand in the drafting of many of the building blocks, including Barret Jackman, Jay McClement, Erik Johnson, Roman Polak, David Perron, David Backes, T.J. Oshie, Patrik Berglund and Alex Pietrangelo.