lesley jonathon cameron was jailed for life on tuesday for the horrific december 2013 murder of maureen anne horstman , 67 , and her 26-year-old daughter tamara alexandra horstman in broad daylight at their warwick home , in perth , wa .
cameron , who was 19 and at the time , also raped tamara but it is not known if she was alive or dead that a used condom with dna evidence was found after the incident , the west australian supreme court heard .