After the officers were indicted, Chicago Police Superintendent Eddie Johnson said the department would continue to cooperate with the ongoing investigation.
Jason Van Dyke, the Chicago police officer accused of murder in the McDonald shooting, was charged in March with 16 new counts of aggravated battery.
The special prosecutor assigned to pursue the investigation announced the charges of conspiracy, official misconduct and obstruction of justice against Detective David March and patrol officers Joseph Walsh and Thomas Gaffney.
A Chicago grand jury has indicted three police officers on conspiracy charges, alleging they interfered with an independent investigation into the 2014 shooting death of 17-year-old Laquan McDonald.
Dashcam video of the shooting - released in November 2015 after a court battle - contradicted almost everything police said happened the night McDonald died.
Special prosecutor Patricia Brown-Holmes announced the indictments Tuesday, saying the three officers "did more than merely obey an unofficial code of silence".
The indictments mark the latest chapter in what has been one of the most troubling stories in the history of a police force dogged by allegations of racism, brutality and the protection of police officers who brutalize African Americans.
March, Walsh and Gaffney conspired to hide the true facts surrounding McDonald's killing in order to protect their fellow officer from criminal investigation and prosecution, the indictment said.
More than a year passed between the shooting and the indictment against Van Dyke, which came as video of the shooting was released.
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"The co-conspirators created police reports in the critical early hours and days following the killing of Laquan McDonald that contained important false information in an attempt to prevent or shape any criminal investigation", according to the indictment in which the three are charged with felony counts of obstruction of justice, official misconduct and conspiracy. Gaffney remains on the force but, per department policy, he has been suspended because of the felony indictment, according to the department.
In fact, the police report described Van Dyke, Walsh, and Gaffney as "victims" of McDonald.
Johnson did not comment specifically on the indictment.
April 15: The Chicago City Council votes to approve a $5 million settlement with McDonald's family.
A grand jury investigation into the case is continuing, Holmes said.
Van Dyke has pleaded not guilty to murder.
Neslund said he has tried to contact McDonald's mother but has not been successful. He still awaits trial, and, if convicted, faces a sentence of 20 years to life. They will appear for arraignment on July 10 at the Leighton Criminal Courthouse.