Glenn won't be eligible for parole again until 2014, said Department of Corrections spokeswoman Katherine Sanguinetti.
Grammer had planned to attend the parole hearing at a state prison in Limon, about 90 miles southeast of Denver, but rain caused him to miss a connecting flight, Sanguinetti said.
Efforts to find a spokesperson for Grammer were not immediately successful.
Karen Grammer was abducted, raped and stabbed in Colorado Springs on July 1, 1975.
Colorado law no longer allows parole in life sentences for first-degree murder, but Glenn was convicted before the law was changed.
Get Action News on your website
