Attorneys for a man serving a life sentence in the 1957 slaying of a 7-year-old Illinois girl are asking for his immediate release from prison, saying a prosecutor's recent investigation shows he is innocent.

The Daily Chronicle in DeKalb reports (http://bit.ly/1ZOT8Dh ) a hearing on the request in Jack McCullough's case is scheduled for Friday.

The attorneys said in their filing that a six-month investigation by the DeKalb County state's attorney showed McCullough's conviction cannot stand.

McCullough was arrested in 2011 and convicted in 2012 for the slaying of Maria Ridulph. Prosecutors said at the time that McCullough choked and stabbed her to death.

But State's Attorney Richard Schmack said the investigation and prosecution was flawed.

A judge told McCullough earlier this week a decisive ruling in his case would require several hearings.

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Information from: The Daily Chronicle, http://www.daily-chronicle.com