Three Chicago Police Department officers on Tuesday were indicted on state charges of obstruction stemming from the fatal shooting of Laquan McDonald.

Detective David March and Patrol Officers Joseph Walsh and Thomas Gaffney were each charged with conspiracy, official misconduct and obstruction of justice, the special prosecutor's office announced on Tuesday.

"The indictment makes clear that these defendants did more than merely obey an unofficial ‘code of silence,' rather it alleges that they lied about what occurred to prevent independent criminal investigators from learning the truth," Special Prosecutor Patricia Brown Holmes said in a press release.

Chicago Police Officer Jason Van Dyke was charged with first-degree murder in late 2015 after police dash cam video showed him fatally shooting McDonald 16 times in October 2014.

Van Dyke has single pleaded not guilty to the charges and is out on bail awaiting trial.

According to the three-count indictment, the men wanted to "shield their fellow officer from criminal investigation and prosecution" and prevent the public from seeing the videos of McDonald's shooting because they knew a video "would inexorably lead to a thorough criminal investigation by an independent body and likely criminal charges."

Gaffney, for example, lied by saying McDonald assaulted the three officers before the shooting.