Yes, it takes alot of brass neck and a cold arrogance to just turn up after committing a crime like nothings happened. Its almost like gloating, catch me if you can mentality, but he doesnt seem to me to be like that.
Didnt someone say he turned up for work the next morning, and other reports saying he was unemployed?
What Im thinking is, if he had nothing to do with it, wouldnt he have been in the town as soon as soon as he heard the news, commenting, joining the searches? he was after all her uncle of sorts. Unless he doesnt watch the TV? But if it was him filmed by the river wouldnt he have seen the crowds searching? Just thinking out loud.