An officer later found a gun in Sterling's pocket, but the convenience store owner said the gun was never in Sterling's hand.
A pair of white police officers in Baton Rouge, La., will not be prosecuted by the state authorities in a fatal shooting of a black man there nearly two years ago.
Landry will provide an "update" on his office's investigation of Sterling's July 2016 shooting death during a news conference later Tuesday morning, the attorney general's office said.
Attorneys for Sterling's relatives have said federal authorities told them Salamoni pointed a gun at Sterling's head and threatened to kill him before the struggle began.
The news comes 10 months after the U.S. Justice Department declined to charge the two cops, citing "insufficient evidence".
NBC News reports that Salamoni believed Sterling was reaching for a gun in his pocket. The officers told Sterling to put his hands on the hood of a auto and struggled with him when he didn't comply, the Justice Department said.
Louisiana Attorney General Jeff Landry says a black man fatally shot by two white police officers had illegal drugs in his system at the time of the encounter outside a convenience store.
Landry said the police officers "used verbal commands" and "several non-lethal techniques to gain control of Mr". Salamoni them fired three shots into Sterling's chest. It was "reasonable" to conclude Sterling was under the influence of drugs during the struggle with the officers "and that contributed to his non-compliance", Landry said. "It takes courage to be a prosecutor and it takes courage to fight for justice", Stewart said.
Body camera and surveillance video haven't been released, but cellphone video of the encounter went viral.
The announcement makes Sterling's death the latest high-profile police shooting to end without charges for officers involved, following on the heels of federal authorities previous year declining to prosecute either officer in the case. "We came to this conclusion after countless hours of reviewing the evidence", Landry said.
Louisiana's attorney general has ruled out criminal charges against two white Baton Rouge police officers in the fatal shooting of a black man whose death fueled widespread protests.
Of those officers, 41 have not been convicted, a lot of them acquitted by juries or during a bench trial, he said. 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.
One of Sterling's aunts, Sandra Sterling, said Salamoni took an oath to protect and serve, not "protect and kill". When he did not, a struggle ensued with Salamoni pulling out his gun and pointing it at Sterling's head and later Lake attempting to shoot Sterling with a Taser. He then shot him three more times as Sterling sat up on his back.
He supported calls for the Baton Rouge Police Department to conduct a review to determine if disciplinary action should be taken. As we move into this next phase of the investigation, I continue to ask the people of Louisiana to pray for Alton's family, the community of North Baton Rouge where he lived, the law enforcement officials who protect us every day, and our great state.
Both officers were placed on administrative leave but faced no further punishment.