In his opinion for the court, Justice Eugene Doherty found fault with prosecutors for basing their arguments against release on the way Grayson acted during the shooting.
His body was found among recycling materials being processed at Midwest Fiber.
Ongoing investigation has identified more than 275 cases of wrongdoing since 2022.
The 22-year-old Springfield man was arrested after police linked him to incidents at Country Inn and Suites, Shangri La Dispensary, a Yale Avenue home.
Corrections dept points to Springfield blog
Street value of seized drugs is estimated to be more than $150,000.
Michael Turner is being held in the Sangamon County Jail.
SPD confirms recent retail theft and ATM thefts, but said there is no information indicating the incidents are related.
37-year-old Springfield man arrested