A man charged in a 2012 killing on the Dan Ryan was incorrectly released from prison on Friday when he was found to be eligible for parole in an unrelated attempted robbery case, according to officials and records.

Cook County sheriff’s officials were notified Monday that Garrett Glover, 29, had been released from Illinois Department of Corrections custody after being sentenced to four years in prison Thursday in a 2014 attempted armed robbery case from County Club Hills. Glover is awaiting trial in the Sept. 5, 2012, shooting of Larry Porter, 25, near 87th Street on the Dan Ryan.

Glover had been in jail since at least February 2014, and when he was sentenced last week was given credit toward his four-year prison term for already serving 879 days in jail, according to court records. He was released on parole on Friday, according to Illinois Department of Corrections records.

"Glover should have been returned to custody of the Cook County Jail on the other case," but instead was released, according to a news release from the sheriff’s office. "The Sheriff’s Office is investigating the circumstances surrounding his release, and all efforts are being made to secure his apprehension."

Glover, Patrick Calvin and Tyrone Mixon are awaiting trial in the 2012 Dan Ryan killing, according to court records. Calvin is being held in Cook County Jail, while Mixon is serving a prison term in an unrelated case in  Wisconsin, according to records.

Porter was driving a black 2012 Jeep Grand Cherokee south on the expressway when he was shot by another motorist, police said at the time of his killing. Glover, Calvin and a third man — identified by Illinois State Police as Mixon — shot at Porter from inside a maroon van they had borrowed from a North Side woman Glover knew, prosecutors said when the three were charged.

Another in the Jeep man was shot, but the then-27-year-old man in the back seat, later identified as the owner of the Jeep and the target of the shooting, wasn’t injured.

Anyone with information about where Glover might be is asked to call the Cook County Sheriff’s Command Center at 773-674-0169. The public is reminded that aiding a fugitive is a Class 4 felony, punishable by 1-3 years in the Illinois Department of Corrections.

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