It certainly hasn't, and the comments here show that he's already been found guilty by some.
Disappearing again proves not very much. So for example, if he run into her, and knocked her into the river, by accident, panicked, not unreasonably given he has previous for murder, and hid the body before having it on his toes then while it's not what you'd call reasonable, but he wouldn't be guilty of anything much legally, furious riding perhaps, but even that would be difficult to prove.
Of course the possibility that there's an alternative explanation, or that he may have absolutely nothing to do with it doesn't seem to have occurred to some.
As usual, the Court of Armchair in front of the internet is in session!