Calhoun County District Attorney Ben Creekmore says Wayne Thurman Harris of Slate Springs made the plea Monday in Oxford before special Circuit Judge Breland Hilburn.
Harris had faced more severe charges of depraved heart murder in the 2013 death of Chris McGonagill of Calhoun City.
Creekmore says Harris was sentenced to five years in prison, followed by a 15-year suspended sentence. He also was sentenced to five years of post-supervision release.
Authorities say Harris and McGonagill argued at a cookout and both fired guns. Both were wounded, McGonagill fatally.
Harris was pardoned by Barbour in 2012 after serving a sentence for selling marijuana.