Walker scored his first goal of the season in Thursday's 2-1 loss to the Flyers.
Walker had a goal and an assist in Sunday's 4-1 win over the Kraken.
Walker tallied a goal and an assist in Tuesday's 4-3 loss to the Avalanche.
Walker scored a goal and dished out three hits in Sunday's 7-2 win over the Canadiens.
Walker signed a two-year, $1.55 million contract extension with the Blues on Tuesday.
Walker was brought up from AHL Springfield on Monday.
Walker was waived by St. Louis on Sunday, Chris Johnston of TSN reports.
Walker registered an assist in a 5-3 loss to the Golden Knights on Sunday.
Walker is averaging just 9:50 of ice time this season, his lowest since joining the Blues ahead of the 2019-20 campaign.
Walker (wrist) re-signed with St. Louis on a one-year contract Thursday.