Dwayne R. Marshall, 31, is scheduled to be sentenced Jan. 2.
The involuntary manslaughter charge has a three-year firearm specification.
Marshall shot and killed his cousin, 26-year-old Dante Jones, during an argument in July 2017, according to Dayton police.
Marshall left the scene at Catalpa Drive, but later turned himself in.
Jones died from a single gunshot wound.
Marshall was originally indicted on murder, felonious assault and tampering with evidence charges in April.
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His trial was scheduled to begin Monday morning, but Marshall pleaded guilty to a lesser charges.
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