This story was originally produced by the Valley News . NHPR is republishing it in partnership with the Granite State News Collaborative .

The man serving a mandatory lifetime sentence for murdering two Dartmouth College professors 24 years ago has cleared another legal hurdle in his effort to become eligible for parole.

A state Superior Court judge this week denied a request by prosecutors to reconsider his ruling on the constitutionality of the New Hampshire law mandating minors guilty of certain crimes be sentenced to life without the possibility of being released from prison.

Robert Tulloch, 43, of Chelsea, is serving two consecutive life sentences after pleading guilty to first-degree murder in the stabbing deaths of Dartmouth professors Half and Susanne Zantop at their

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