A judge ordered Alstory Simon's release Thursday after Cook County prosecutors re-examined the case.
Simon's initial confession led to the release in 1999 of another man who was on death row for the killings.
Simon told reporters outside Jacksonville Correctional Center that he's angry with those who — in his words — "did what they did" to him.
Simon's attorneys say a private investigator coerced the confession with threats and promises of a movie deal and money.
After 15 years in prison, Simon also said he looks forward to meeting his grandchildren for the first time.