Under what circumstances will a defendant be denied parole for life without possibility of parole?

Under a separate heading, defendant contends that because life without parole is imposed upon more serious crimes, characterizing his sentence as the functional equivalent of life without the possibility of parole does not save it from being cruel or unusual. Defendant lists examples of such crimes but makes no further argument to support his contention, or even to explain it. We find this contention insufficiently developed to warrant discussion. (See People v. Medrano (2008) 161 Cal.App.4th 1514, 1520.)