Belton, who was in his second year on the school's faculty, was found slain in his home by a friend Monday morning and Michael Griffin was arrested Monday night at his own house near Bloomington, KXIN-TV, Indianapolis, reported.
Police said they discovered Griffin's name was one of the last names mentioned in Belton's journal and recovered a knife in Griffin's home they believe was the murder weapon.
Rick Wampler, a neighbor of Griffin's, said Griffin "was apparently upset about an incident that happened on Christmas Day involving himself and the victim."
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