Nineteen-year-old Ronnie White was arrested and charged with first-degree murder in the hit-and-run death of a cop. A few days later, White was found murdered in his cell. The only people with access to that cell were corrections officers and prison officials, and several of them have refused to cooperate with investigators.

Aaron Davis, The Washington Post's lead reporter covering the story, talks about the case and why a "blue wall of silence" has developed.

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