Carl Ericsson apparently is guy that holds on to some serious grudges.

The 73-year-old Ericsson was recently sentenced to life in prison for shooting and killing a former high school classmate who put a dirty jock strap on Ericsson’s head.

According to reports, back in January Ericsson went to the victims residence, rang the doorbell asked the mans name and open fire.

Here is an excerpt from the Associated Press…

The startling answer, a prosecutor said Friday, was a 1950s locker room humiliation that festered in Ericsson’s mind for a half-century.

“He said that a jockstrap was put on his head,” Kenneth Meyer said. “It’s the only thing he’s ever mentioned in talking to law enforcement.”

Ericsson, who a psychiatrist said suffered from anxiety and depression for years, last month pleaded guilty but mentally ill to second-degree murder in the death of Norman Johnson.

You can’t make this stuff up.

Ref: The Big Lead, Associated Press