In 2004, David Koschman died after being punched by the nephew of former mayor Richard Daley.
Koschman names two former police superintendents, Cook County State's Attorney Anita Alvarez, her predecessor Dick Devine and unnamed Daley family members and associates.
She says this is all about justice for her son.
It has been almost 10 years since Nanci Koschman's son, David, died from a single punch thrown by RJ Vanecko.
Mrs. Koschman was ready to put the case behind her in January, when the nephew of former Mayor Richard Daley pleaded guilty to involuntary manslaughter, but after reading a 162-page report by the special prosecutor, Koschman decided to keep fighting.
''I read the report and read how hard his head hit the cement, and trust me, I go to sleep at night hearing that sound in my head, I just want justice for David,'' Koschman said.
Koschman hopes a federal civil rights lawsuit will help fill in the blanks of police and prosecutor investigations that she and her attorneys say were botched twice; right after the incident happened in 2004 and again in 2011 when the case was reopened.
''It seems to me they did everything in their powers to make this case go away,'' Koschman said.
Koschman's attorneys say to protect the then mayor Daley and his family - while there is no direct evidence in the special prosecutors report to conclude that Daley influenced the investigation - Koschman's attorneys allege someone in the Daley family or connected to the mayor or possibly the mayor himself must have notified high ranking police department officials about Vanecko's involvement within hours of the incident on April 25, 2004.
''The police responded immediately with a wholesale cover up. Homicide files went missing, witnesses were not interviewed and police reports were changed to blame David Koschman,'' said Locke Bowman, Koschman's attorney.
Nanci Koschman just wants the truth for her son. ''I go to the cemetery and tell him, I'm still fighting for you,'' Koschman said.
Nanci Koschman's attorneys say they will likely call former Mayor Daley and some of his family members as witnesses.
ABC 7 Eyewitness News reached out to several people named in the lawsuit, but no one had a comment at this time.
RJ Vanecko continues to serve a 60-day jail sentence.
