CHICAGO – Almost three months have passed, and the Chicago Police Department appears no closer to solving one of the most bizarre acts of fan-on-fan violence in recent memory. One that left Pittsburgh Steelers fan Zack Heddinger blind, and local authorities searching for a group of Chicago Bears fans that allegedly poisoned him. The frustrating search for clues began a few days after Heddinger passed out at South Loop bar Kitty O’Shea’s, and was taken to Rush University Medical Center following Chicago’s Sept. 20 win over Pittsburgh at Soldier Field. After drinking alcohol that was allegedly offered by a Bears...