A second avalanche death on California’s notorious Mammoth Mountain has a grieving mom reliving the heartbreak of losing her daughter all over again — as horrifying details of the young woman’s final moments have been revealed. Veteran ski patroller Cole Murphy, 30, died in a vicious snowslide at the dangerous mountain in December — less than a year after Claire Murphy, 25, was killed in the same fashion. Claire Murphy — who is of no relation to Cole Murphy — was found pinned upright against a