Officers found a "deceased male outside the residence" who had been shot. The victim was identified as 52-year-old Ozark resident Kenneth Barnes.
Larry Shaw, 88, was taken into custody and charged with first-degree murder and armed criminal action in connection to Barnes's death. He was booked into the Christian County Jail and was being held without bond.
The exact relationship between Barnes and Shaw remained unclear.
The Springfield News-Leader reports Shaw told police he killed Barnes and had been thinking about it for years. Shaw allegedly did not appreciate Barnes's use of vulgar language and the way Barnes treated him.
The News-Leader cited court documents that claim Barnes told Shaw to do chores Wednesday morning. Shaw allegedly retrieved his handgun from upstairs in his home, then sat in a recliner for three hours. When Barnes walked upstairs, Shaw allegedly shot him once in the chest.
According to KOLR-TV, Barnes's daughter went upstairs to check on what happened, and Shaw allegedly told her Barnes was hurt.