Very early, comments from the police made it seem like the dog maybe had bitten the attacker or otherwise had some evidence there. Then I remember some comment about "incomplete" dna or something. So it could be that there is some DNA evidence, but it isn't yet matching anyone. So it could be that we just have to wait and hope. We know there are homeless people that frequent the park, so if one of these people did it, unless they have a felony conviction, they arent the kind of people that would have DNA on file or be in a commercial genealogy data base.
But there must be other evidence. Were there bloody footprints leading away? They searched the lake extensively, was anything found? We saw the photos that the police released early of people coming and going from the park. What I found interesting was what photos apparently didn't show..... a suspect. Was Katie caught on the cameras? There should be more photo evidence that we arent seeing. Maybe we arent seeing it because the photos show nothing. But that in itself is enlightening. It shows where the killer wasn't at. The killer entered and left the park some where and it must have been somewhere other than the 10th st or 12st street gate.