Beall and his lawyer claimed Donald Armstrong III pointed a gun at Beall while they and a woman were at an apartment on Maryland Avenue last summer. Beall told the jury he killed Armstrong in self-defense.
Prosecutors claimed Beall admitted his crimes to police, then came up with new stories before trial.
The charges against Beall included aggravated robbery stemming from a series of bank robberies and a carjacking involving a female pizza delivery driver in Huber Heights.
He was arrested after a chase and crash in Sharonville, near Cincinnati.
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