Kevin Henley Jr., 35, was working security at the Mansion Live Nightclub on Saturday, March 8.
The family of 21-year-old Chicago resident Zulma Daniela Calderon Pacheco says she was having fun with her boyfriend and cousins when a fight broke out at the club.
Stone Park police say Henley pulled out a gun and fired, killing Zulma. The medical examiner has ruled her death a homicide.
Henley is charged with involuntary manslaughter and aggravated unlawful use of a weapon and will appear in court on Tuesday.