For years, Corey Atchison told anyone who would listen that he was wrongly imprisoned on a 1991 first-degree murder conviction related to the shooting of a man east of downtown Tulsa.
But the idea of being released became much more of a reality to Atchison once a judge freed his brother, Malcolm Scott, from prison in 2016 after finding him and another man actually innocent in an unrelated 1995 murder case.
Here are some notable inmate releases along with the private investigator who worked on several of the cases.
Video: A private investigator helping release the innocent
Private Investigator Eric Cullen discusses his job and his part in helping in the release of Malcolm Scott and De'Marchoe Carpenter who were wrongly convicted to life prison sentences.