An Indiana man in prison for murder was accidentally released Thursday in Chicago, Illinois.

Indiana state police say 44-year-old Steven L. Robbins, who was convicted of murder in 2002, was transferred from Indiana State prison to the Cook County Circuit Court in Chicago on an unrelated controlled substance charge.

The drug charges against Robbins were dropped, “but for reasons yet unknown,” Illinois authorities released the convict instead of returning him to the Indiana prison.

Robbins was sentenced to a 60-year prison sentence for the murder conviction. The earliest Robbins could have been released from jail was June 29, 2029.

The FBI and U.S. Marshals Service have been notified and a warrant has been issued in Indiana and Illinois for Robbins, who has been on the run since Wednesday night, according to the Chicago Tribune.