A former Georgia police officer, who was charged with fatally shooting a naked, unarmed African American man who was mentally ill, has been found not guilty of murder.

Robert "Chip" Olsen was acquitted of two felony murder charges by a jury in DeKalb County on Monday, about four years after he shot and killed Anthony Hill, according to CNN. The jury, however, did find Olsen guilty of aggravated assault, making a false statement, and two counts of violation of oath.

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Olsen fatally shot Hill, a 26-year-old Afghanistan War veteran, in March 2015 after responding to a report that a man was acting erratically and crawling on the ground naked in an Atlanta neighborhood. DeKalb County Police Chief Cedric Alexander said at the time of the shooting that someone had called police to report someone acting in a "deranged" fashion.

Alexander stated that "when [Hill] saw the officer, he charged, running at the officer," CNN noted.

Olsen, who is white, called for Hill to stop moving before drawing his weapon and firing two shots. Hill had a history of mental illness and had been diagnosed with bipolar disorder and post-traumatic stress disorder (PTSD), the Associated Press reported.

Prosecutors reportedly claimed in their closing statement that Olsen violated protocol for officers by firing his weapon at Hill. Assistant District Attorney Lance Cross asserted that the former police officer could have used something other than a firearm, such as a baton.

"Chip Olsen is not a murderer and is not guilty of any count in this indictment," Olsen's attorney, Amanda Clark Palmer, argued, adding that Olsen had to make a "tough decision."

The defense also noted that Olsen had never faced allegations of excessive use of force before the incident.

Olsen's verdict was announced just weeks after a former Dallas police officer was convicted of murder over the fatal shooting of an African American man.

Amber Guyger received a 10-year prison sentence on Oct. 1 for shooting and killing Botham Jean inside his own apartment. Guyger testified during the trial that she thought she was in her own apartment at the time and that Jean was robbing her home, the AP reported.