Arthur Fletcher

Anthony's twin brother, who murdered the family of his twin, he always was jealous. Always smiling like a maniac, he worked in a university where no one would suspect poor old Professor Fletcher killed Detective Fletcher's wife and kids, no?

He has a mid-male pitch, but fast and manic, speaking as if he was feeling euphoria every second. He and Anthony both have a quirk that the more agressive they speak, the higher the pitch. Arthur would have a slightly higher pitch in this case.