Defensive coordinator Alan Williams has been on a personal absence since at least Thursday, and I can’t tell you when we will see him next.

Source: https://www.chicagotribune.com/sports/bears/ct-cb-chicago-bears-mailbag-matt-eberflus-20230920-e6drpzwsmngivnfrsnsvyoxxli-story.html

"I spent 14 years here," said Bears defensive coordinator Alan Williams, a longtime Colts assistant.

Source: https://www.dailyherald.com/sports/20230816/chicago-bears-training-camp-report-for-aug-16-fields-offense-has-good-bad-moments-vs-colts-in-indy

The abrupt and abnormal resignation of defensive coordinator Alan Williams with what sources told the Tribune was a conduct-related exit was the biggest fire general manager Ryan Poles and coach Matt Eberflus have had to contain and clean up after.

Source: https://www.bostonherald.com/2023/10/12/in-the-last-2-games-justin-fields-has-been-___-the-defense-needs-___-insights-on-4-chicago-bears-questions-2/