According to Louisiana Attorney General Jeff Landry, the officer's fatal actions were deemed "well-founded and reasonable".
"The Louisiana Department of Justice can not proceed with a prosecution of either Officer Howie Lake or Officer Blane Salamoni", Landry told reporters after meeting with members of Sterling's family in private.
The Attorney General released a report on the full investigation into Alton Sterling's death.
This comes after the Department of Justice ruled not to charge officers Blane Salamoni and Howie Lake II in the shooting of Alton Sterling on the federal level in 2017.
Landry said the review found that the officers followed proper protocol in attempting to make their arrest of Sterling in the early hours of July 5, 2016.
The LA Attorney General says Sterling was armed and risky.
But his decision is not the last chapter of the case, as the police department plans to hold hearings on whether to discipline the officers, and says it intends to release four videos that have yet to be made public. They reported that Sterling had a gun in his pocket.
The officers "had reason to believe [Sterling] was armed with a firearm and was continuously resisting", Landry said.
Both veteran officers were placed on administrative leave after the shooting, which catalyzed protests against police violence in Louisiana and other states around the country - including Minnesota, where a black man was killed in another high-profile shooting just days later.
In May 2017, the US Department of Justice announced it would not press charges against the officers.
"The way they killed him was in cold blood", she added.
Officer Salamoni was the only officer to fire his weapon, killing Sterling.
Officers reportedly got a call saying a person matching Sterling's description threatened someone with a gun. At the time, police said that Sterling had been reaching for a gun.
Federal authorities said their ten-month investigation failed to uncover evidence that the officers "willfully" deprived Sterling of his civil rights. Salamoni eventually holstered his gun, tackled Sterling to the ground and tried to control Sterling's right arm, and Lake knelt and tried to control Sterling's left arm, the state report says. In this July 6, 2016 file photo, photos of Alton Sterling are taped to the wall at a makeshift memorial outside the Triple S convenience store in Baton Rouge, La.
Last year, lawyers for Sterling's five children filed a wrongful death lawsuit against the city of Baton Rouge, its police department and former police chief, and the two officers involved. It also claims poor training and inadequate police procedures led to Sterling's death.
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