The Cardinals released Walker on Monday, Darren Urban of the team's official site reports.

Walker was elevated to the main roster as a COVID replacement for running back Jonathan Ward, Aaron Wilson of Sportstalk 790 Houston reports.

The Football Team released Walker on Monday, Ben Standig of The Athletic reports.

Walker (undisclosed) is active for San Francisco's Week 12 matchup at the Rams.

Walker (undisclosed) was activated from the reserve/COVID-19 list Saturday and is questionable for Sunday's game against the Rams, Matt Barrows of The Athletic reports.

The 49ers placed Walker on the reserve/COVID-19 list Thursday.

The 49ers signed Walker to the active roster Wednesday.

The 49ers elevated Walker from the 53-man roster via the practice squad Sunday.

The 49ers and Walker agreed to a one-year contract Monday, Tom Pelissero of NFL Network reports.

Walker notched 65 tackles (41 solo) and forced one fumble in 16 games during the 2019 campaign.