Stan Bowman, the Chicago Blackhawks’ general manager and president of hockey operations, resigned Tuesday after an investigation commissioned by the team found he was among a group of leaders who failed to respond promptly to allegations that an assistant coach sexually assaulted a player in 2010. The Blackhawks hired Jenner & Block to conduct what they called an independent review in response to two lawsuits filed against the franchise: one alleging sexual assault by then-assistant coach Brad Aldrich during the team’s Stanley Cup run in 2010 and another filed by a former student whom Aldrich was convicted of assaulting in Michigan. Team CEO Danny Wirtz called the report “both disturbing and difficult to read,” and the NHL fined the team $2 million for mishandling the accusations. “Today’s fine represents a direct and necessary response to the failure of the club to follow up and address the 2010 incident in a …