CHICAGO (CBS) — A bus load of Chicago police officers and supporters is headed to Springfield this morning to try to make sure a convicted cop killer remains behind bars.

The state says 68-year-old Joseph Hurst’s projected parole is in the year 2107.

Hurst was first sentenced to death.

However, after a change in law, he was re-sentenced to 100 to 300 years in prison for killing Chicago police officer Herman Stallworth during a traffic stop at Marquette Road and Cottage Grove in 1967.

He was also convicted of trying to kill police officer Eugene Irwin and detective Raymond Hederman and of robbing a CTA bus driver and another man in 1966.

Hurst was sentenced to up to 70 more years behind bars for the attempted murders and the robberies.

Hurst is serving his sentence at the Dixon Correctional Center.

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