DENVER (AP) -- Colorado's prisons chief is at least the second person to be killed while he was in charge of a state penitentiary system.
Michael Francke, head of the Oregon Department of Corrections, was fatally stabbed outside his office in Salem, Ore., in January 1989.
Prosecutors speculated Francke was killed in an attempted car burglary. He was 42.
Frank Gable was found guilty in 1991 of aggravated murder in Francke's slaying and is serving a life sentence without the possibility of parole.
Oregon officials say that before Francke's slaying, Gable had spent a total of seven years in Oregon prisons on three separate occasions for convictions on robbery, burglary, forgery and failure to appear charges.
Gable has maintained his innocence in Francke's death, and his supporters say he was wrongly convicted.
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