Those convicted of first degree murder are rarely paroled in any state. If it is possible for parole, the elapsement of time will be a condition of the sentence or individual state statute.
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There are many things that play a part in a murder case but the hardest is death penalty if they have that or life in prison. It depends on what country and state you are talking about.
Those convicted of first degree murder would have to serve 25 years before being eligible for parole.- http://dsp-psd.pwgsc.gc.ca/Collection-R/LoPBdP/BP/bp348-e.htm