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Sheley has pleaded not guilty to murder charges in the June 2008 death of 65-year-old Ronald Randall of Galesburg.
The 30-year-old Sheley is also charged with murder in five other deaths in Illinois and two in Missouri.
He's serving a seven-year sentence at the Pontiac Correctional Center after being convicted last year of attacking workers at the Knox County Jail while awaiting trial.
He's due back in court in June.