CHICAGO -- Chicago Bears running backs coach David Walker was fired Tuesday over his behavior in the workplace, a source confirmed to ESPN.
The Bears' human resources department was involved in the decision.
Bears coach Matt Eberflus announced Walker's dismissal Wednesday but did not disclose reasons for the decision other than saying "standards were not met."
A source told ESPN that Walker had previously been reprimanded by Bears HR for his workplace behavior and that a second such instance led to his firing.
Walker, 53, is the second Bears assistant coach to leave the staff this season. Former defensive coordinator Alan Williams resigned on Sept. 20, citing the need to "take care of my health and family."
The Bears' HR department also was involved in the decision that led to Williams' resignation, a source told ESPN's Adam Schefter, but that instance is not related to Walker's firing.