Smith shot Mason, his mother’s boyfriend, with Mason’s own shotgun while Mason slept on a couch.
Mason died instantly, and then Smith called 911.
Smith was later indicted in June 2013 for aggravated murder, an unclassified felony.
After nearly three years of preliminary psychological evaluations and pretrial motions, Smith entered a plea of guilty as charged, according to Preble County Prosecutor Attorney Martin Vogel.
“This murder was cold and it was calculated. The defendant himself admitted that he had been considering killing Jerry Mason for several weeks before the crime and that he had even contemplated the different methods he might use to kill Mr. Mason,” Vogel said in a release.
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