Jurors deliberated for just over nine hours before finding Tulsa officer Betty Jo Shelby not guilty in the Sept. 16 shooting of 40-year-old Terence Crutcher.
A lawyer for Shelby said the officer was "elated" that the jury found her not guilty.
"She's ready to get back to her life," Defense Attorney Shannon McMurray said.
But Jerad Lindsey, chairman of the Tulsa Fraternal Order of Police, said the city would have to heal after the tragedy.
Dashcam Video of man fatally shot by Tulsa PD
An unarmed black man fatally shot by a white Tulsa, Oklahoma, officer responding to a stalled vehicle last week can be seen in police dashcam video walking toward his SUV with his hands up and officers following behind him before he's shocked with a stun gun and then fatally shot.
"Tulsa is going to have to figure out how to get its arms around this." he said after the verdict was announced.
Shelby said she fired her weapon out of fear because she said he didn't obey her commands to lie on the ground and appeared to reach inside his SUV for what she thought was a gun. Crutcher was unarmed.
Prosecutors told jurors that Shelby overreacted. They noted Crutcher had his hands in the air and wasn't combative - part of which was confirmed by police video taken from a dashboard camera and helicopter that showed Crutcher walking away from Shelby, hands held above his head.
Shelby's attorneys argued that in the two minutes before cameras began recording the encounter, Shelby repeatedly ordered Crutcher to stop walking away from her and get on the ground.
Shelby also said she feared Crutcher was under the influence of PCP, a powerful hallucinogenic known as Angel Dust that makes users erratic, unpredictable and combative.
An autopsy showed PCP was in Crutcher's system, and police said they found a vial of it in his SUV.
Crutcher's family said police attempted to "demonize" Crutcher over the drug possession to deflect attention from the fact officers didn't find a gun inside his SUV.
The killing of 40-year-old Crutcher was among a spate of officer-involved shootings in recent years that helped galvanize the Black Lives Matter movement and prompted calls for more police accountability.
Tulsa County District Attorney Steve Kunzweiler charged Shelby six days after the shooting. An affidavit accused her of "becoming emotionally involved to the point that she overreacted."
Defense attorney Shannon McMurray argued that prosecutors rushed to charge Shelby for political reasons, fearing civil unrest like the angry street protests that erupted in Charlotte, North Carolina, after the fatal shooting of 43-year-old Keith Lamont Scott four days after Crutcher was killed.
Report a typo to the ABC13 staff