Harris was sentenced to 20 years in prison after waiving a pre-sentencing investigation.
The manslaughter charge has a three-year firearm specification.
The charges stemmed from the Oct. 28, 2016, deadly shooting at Summit Square Apartments.
Shackelford, who ran a store out of his apartment, was shot during an attempted robbery, according to Dayton police.
He died from injuries the next day.
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