It happened in a Detroit alley in 1967.
Detroiter John Hall and an accomplice beat a man who later died of his injuries.
John Hall was convicted of first-degree murder and received a mandatory sentence of life in prison without parole. He was 17 years old. His accomplice was never arrested.
But Hall's future changed with two landmark rulings from the U.S. Supreme Court – rulings that outlawed mandatory sentences of life without parole for juveniles.
On Feb. 2, at age 67, John Hall walked out of a Michigan prison.