A Fayetteville man was mentally ill but responsible for his actions when he stabbed his uncle more than 75 times and killed him, a jury found.

Mustafa Mahdi, 21, was convicted of his uncle’s murder in a Fayette County court last week. He was just 17 when he attacked David John Quincy at a home on Sylvan Loop in March 2014, prosecutors said.

Quincy came to the home that day to help his nephew and suggested Mahdi come and live with him, Fayetteville police Lt. Mike Whitlow told AJC.com at the time.

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“Mahdi and Quincy became engaged in a heated argument and Mahdi began stabbing him,” Whitlow said.

Quincy later died at Atlanta Medical Center.

After a week of trial, the jury returned guilty verdicts July 23 on charges of malice murder, felony murder, aggravated assault and possession of a knife during the commission of a felony.

“The jury found that the defendant was guilty but mentally ill,” a spokesman for Griffin Circuit District Attorney Benjamin D. Coker said.

He was sentenced to life in prison.

“This was a challenging case,” Coker said in a statement. “This is a good result for the victims and for the community as a whole. We hope now that the victims can find some peace and begin the healing process.”

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