Re: Guilty? Possibly. Beyond a doubt? No Way!
Is there any evidence at all that someone else did so? No. - Do you actually know there is no evidence, or just saying that you haven't seen any as a person not at the trial? Why would the prosecution bring up information that revealed someone else did it?
Is there evidence that a co-worker hated him? Yes.
Is there any evidence at all that one of those who hated him set him up? No. Again - there would not be any evidence exposed to this - the prosecutor has to prove that HE did it, not that he could have done it.