Prosecutors found the case against one of the alleged shooters — Alexander Villa, known as “Flip” — was lacking and refused to file charges. 

After Villa’s release, CPD kept trying to strengthen the case against him. The efforts involved a joint operation with federal authorities. The operation, dubbed Snake Doctor, sought to dismantle the gang and generate witnesses against Villa, according to internal police records obtained by his attorney. Within five weeks of the killing, police had arrested 122 people tied to the gang, according to a CPD deputy chief’s tally. 

Amid accusations, State’s Attorney Kim Foxx pulls Conviction Integrity Unit chief off a big case

Defense allowed to review investigative file after allegations police did not disclose evidence in slaying of off-duty cop 

11 years after off-duty Chicago cop’s murder, the case against his alleged killers has frayed

Judge wants CPD to turn over full documents in off-duty cop

Defense attorneys in a Chicago cop’s murder want prosecutors removed