A person familiar with the decision disclosed it to the AP on Tuesday. The person was not authorized to talk publicly about the decision and spoke to the AP on condition of anonymity.
The decision doesn't prevent state authorities from investigating Sterling's death themselves and pursuing their own criminal charges.
The July 2016 shooting set off protests in Louisiana's capital and beyond.
A police report says the officers saw the butt of a gun in one of Sterling's pants pockets and saw him try to reach for it before he was shot.
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