Yes, Vn_survivor_67-68, either they have DNA evidence or (as some are speculating) they have photograph/video evidence. Freddie's side business was selling dirty pictures, so he may have done them all in.
I keep going back to something I read early on about Beth seeing a picture of Natalie and saying "We can fix her" I'm wondering if these are the photos she was speaking of. I had thought that it was from a camera phone....