They really didn't say anything at the presser. They are showing the home on HLN now.
They did not confirm if he turned themselves in and it appears all affidavits, etc are sealed.
If it is true that mom turned him in, I imagine she must have given DNA like toothbrush bc otherwise they would not have made an arrest so fast
It seems from presser that they are in very early stages of investigation, so it seems to me that it is not circumstantial evidence that led to arrest but forensic. but LE is not saying ANYTHING about any of that,