Innocent people have been convicted with "damning" circumstantial evidence. We want the right person convicted, so as I said, I hope they have actual physical evidence tying him to the crime.It's very damning circumstances though. Now that he has put himself at the Freedom Bridge at ~1:30 (thanks to the 1:26 timestamp on the teenage girl's bench photo, coupled with his confirmation that he was the guy they saw), and admitted walking to the first platform on the high bridge, that puts him at the bridge platform at ~1:40ish
The witness parked at 1:46 (verified by camera) and walked straight to the bridge, and saw a guy on that platform. Is it possible that wasn't him? Well he would have had to turn around and leave immediately in order for it to not be him. Then the timing would have to be perfect for him to not pass that witness on the trail. There isn't much wiggle room here. No time for watching fish or whatever he said he was doing.