North Carolina state prosecutors announced Friday that they won’t retry a white police officer who fatally shot an unarmed black man, saying that talking with jurors after the mistrial helped convince them they cannot get a conviction.

The jury deadlocked 8-4 last week in favor of acquitting Charlotte-Mecklenburg Officer Randall Kerrick, leading the judge to declare a mistrial. Kerrick was charged with voluntary manslaughter in the September 2013 death of Jonathan Ferrell, a former college football player.

“In consideration of the jurors’ comments, the evidence available to the state, and our background in criminal trials, it is our prosecutors’ unanimous belief a retrial will not yield a different result,” Senior Deputy Attorney General Robert Montgomery told the Mecklenburg County district attorney.

Police say Ferrell wrecked his car on the morning of Sept. 14, 2013, and went to a nearby house and banged on the door, apparently seeking help. The resident called police, and three officers, including Kerrick, responded.

Investigators say one deployed his Taser without apparent effect on Ferrell before Kerrick fired 12 shots, 10 of which hit him.

Kerrick testified that he repeatedly fired because Ferrell kept charging at him and that he didn’t think his weapon was even working.

Prosecutors said nonlethal force should have been used to subdue Ferrell, who played football at Florida A&M University. The two officers with Kerrick didn’t fire their guns.

After three weeks of testimony and four days of deliberations, the jury couldn’t overcome its deadlock.

“Our prosecutors believe they were able to introduce the relevant evidence and examine the witnesses, including the defendant, appropriately and that the jury fully considered the details of the case,” Montgomery wrote. “However, meeting the standard of proof of beyond a reasonable doubt could not be achieved.”

The Ferrell family has settled a lawsuit with the city of Charlotte, receiving $2.25 million. Chris Chestnut, the attorney for the Ferrell family, wasn’t immediately available for comment, but Ferrell’s mother told The Charlotte Observer that she doesn’t think prosecutors tried hard enough to convict Kerrick.

“They didn’t try hard enough. It was just another black life,” Georgia Ferrell told the Observer. “They don’t care.”

She said two prosecutors called her Friday morning to tell her that the case would not be retried.

“I am going to continue to fight,” she said. She already planned to use part of the civil settlement for a foundation named for her son. “I am going to work on the foundation, continue to work for justice. It’s not the end.”

Kerrick has been free on bond. He is suspended without pay from the Charlotte-Mecklenburg Police Department.