Walker signed a contract with the Commanders on Tuesday.
Walker recorded 10 tackles (seven solo) in Sunday's 24-10 loss versus the Cardinals.
The Steelers elevated Walker to their active roster ahead of Sunday's game against the Browns.
Walker has been claimed by the Bears off waivers.
Walker registered 107 tackles (56 solo), six pass defenses, two interceptions, one sack and one forced fumble across 16 appearances during the 2022 campaign.
Walker notched eight tackles (two solo) during Sunday's 19-16 loss to the Steelers.
Walker notched nine tackles (one solo) and one interception during Sunday's 19-13 loss to Washington.
Walker recorded eight tackles (three solo), including one for loss, and two pass defenses during Sunday's 27-24 win over the Bears.
Walker registered eight tackles (five solo) during Thursday's 25-15 loss to the Panthers.
Walker recorded nine tackles (five solo) during Sunday's 20-17 loss to the Chargers.