Tony Overlin, 24, of Bethany, was originally charged with second degree murder and first degree assault in the beating death of 21-year-old Tomarken Smith outside a Maryville bar.
Wednesday afternoon, Overlin pleaded guilty to involuntary manslaughter in Buchanan County Court and was sentenced to 6 years in prison.
Tuesday, Kevin Mooney also pleaded guilty in Nodaway County to the same charge for his role in Smith's death. Mooney is scheduled to be sentenced Sept. 30.
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Smith was beaten near the corner of East 4th and Market Streets in Maryville on Sept. 14, 2012.
Smith was found unconscious and later died.