da. still, to solidify their case, might be why is that the da decided, for boyd to pay gregory one more visit. see if he could turn up some fresh evidence. perhaps, with luck, to puncture gregory s consistent denial, that he had gone back to the house, after putting the girls in the car. so, in 2008, 25 years after the murder, boyd took one last shot. two colleagues conducted the interview, and used an old if, on lovely, tactic. perfectly legal. they told gregory ally. it was a ruse. the detective told gregory that his dna had been found on the waistband of kits tights. he pushed gregory to explain, how could ve got in there? remember, it wasn t true.