Where did they leave DNA? The violence against Meredith attributed to AK and RS didn't leave any DNA traces to begin with. The stabbings, the head and face wounds, the bruises, the strangle. The simple fact is that if you have a knife in your hand, you will leave DNA on the knife. That is what AK did. Both RS and RG left traces on the bra. Then there is a trace of RG inside of Meredith, and a trace of RG on the sweater. That is all there is of the violence against Meredith. The rest of the traces of RG were left after the murder, because he stayed in the room and the others left.