The shooting happened at Abbott Park at 95th Street and Michigan Ave. in Chicago's Roseland neighborhood as an adult baseball league was playing a game.
League founder James McDowell said he's been told there may have been a dispute between Hall and a player over playing time. Williams was reportedly upset that Hall would not let him bat.
A relative told ABC7 Hall was shot twice in the back and once in each arm.
Williams will appear in court next on September 14.