Lamar Johnson: "I am a freed man, an exonerated man and a blessed man"

Lamar Johnson, a St. Louis, Missouri man, had spent almost three decades in prison before he was finally set free in February 2023. "48 Hours" correspondent Erin Moriarty takes an in-depth look at the case and for the first time talks to the witness who helped put him away -- a witness who says he was pressured by law enforcement to identify Johnson as one of the killers.

Convicted at 21, and still locked up at 49, Lamar Johnson has spent most of his life in prison for a crime he did not commit.

Erin Moriarty (July 2021): How do you keep up hope?