49ers fire D-coordinator Steve Wilks after one season

- Internal and external candidates considered for coordinator position.

- 49ers will seek third defensive coordinator in three seasons.

- Wilks faced criticism for in-game decisions and late-season struggles.

- Shanahan accepts responsibility for defensive challenges

- Defense sees ups and downs under Wilks in 2023.

- Shanahan cites scheme fit for Wilks' departure.

- Steve Wilks dismissed as 49ers' defensive coordinator after one season.

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