Oh please, if Timon is your biggest suspect, then your investigator is a moron. He's a meerkat, for crying out loud. Meerkats don't kill people. Unless your mayor was, in fact, an insect. He wasn't, was he?

Seriously... I dunno why you even bother with all the secrecy. You haven't even said HOW your mayor died yet. Unless you've got some kind of evidence linking Timon to the guy's death - which I doubt - then just leave him alone and stop whining about his opinion. It's not like he's forcing people to listen to him or anything.