After Cameron Monaghan ‘s final scene on Gotham , there’s no question that his character Jerome is actually the Joker…right? After Jerome pretended to be a sweet and innocent young man all episode long, mourning his mother who was brutally murdered, Det. Jim Gordon–played by
Ben McKenzie–figured out that it was actually Jerome who killed her in the first place. When he confronted Jerome in an interrogation room in the GCPD precinct, Jerome dropped his vulnerable act, and showed his true colors as a maniacal, sociopathic murderer who felt no remorse over the matricide.