Uproxx reports Another member of the Gallagher family is leaving Shameless. First there was Emmy Rossum, the Showtime show’s eldest daughter Fiona, who announced she was parting ways after nine seasons. Now Cameron Monaghan, who plays middle Gallagher sibling Ian, has announced he’s departing, too. The news broke on Monaghan’s Instagram account. The actor wrote: “I have known since last year, but I didn’t want to give it away too early as I wanted this season to be a surprise for the audience.