A man was freed from prison Thursday after Cook County prosecutors threw out a double murder conviction that is linked to one of Illinois' most pivotal death penalty cases.
Alstory Simon confessed to killing two people on the South Side in 1982.
His 11th hour confession in 1999 may have saved the life of Anthony Porter who had been convicted of the killings and sentenced to death.
Porter was released from prison two days before his scheduled execution.
Porter's case sparked widespread reform and ultimately the end of capital punishment in Illinois.
Cook County State's Attorney Anita Alvarez decided to re-examine the case when Simon's lawyers argued the case against him was weak.
In a news conference Thursday, Alvarez said the investigation was "so deeply corroded and corrupted" that her office could no longer maintain the legitimacy of the conviction.
It's not known if anyone else will be prosecuted for the double murder.