Man Murders Former Classmate after Holding 50-Year Grudge

In June of 2012, Carl Ericsson, a 73-year-old South Dakota man, was sentenced to life in prison after admitting to the murder of a former high school classmate. Friends and family members were shocked that the once-successful insurance salesman seemed to snap. Ericsson had been married to his wife for over 44 years.
But after the murder, Ericsson's secret finally came out. For over 50 years he had simmered with a belated grudge: He was still mad about a classmate who had once pulled a jock strap over his head during a high school locker room prank. Norman Johnson, the classmate and murder victim, was a star athlete on the track team. Ericsson was a student sports manager. According to Ericsson's confession, on one occasion Johnson put a jock strap on Ericsson's head, humiliating him and planting the seed of resentment that would continue to grow for over half a century. Apparently, throughout their lives, Norman Johnson continued to outshine Ericsson. Prior to his murder, Johnson had competed in college football, earned a degree, and then taught and coached at his alma mater for more than three decades.
After holding the grudge for over 50 years, Carl Ericsson rang Johnson's doorbell and shot him dead. Ericsson told a judge, "I guess it was from something that happened over 50 years ago. It was apparently in my subconscious." During his sentencing, Ericsson turned to Johnson's widow and apologised, saying, "I just wish I could turn the calendar back."

Cameron Smith, Bizarre S.D. murder caused by resentment over 50-year-old locker room jockstrap prank,"

Yahoo Sports Prep Rally blog (18 June 2012)