US TV
Rex Features
The 35-year-old, who is the real-life husband of leading lady Rebecca Romijn, will reportedly appear in the final two episodes of the show's initial 13-episode order.
His character Colin is said to be an attractive neighbour of Kat's who is hiding a "dark and magical secret".
O'Connell and Romijn have previously worked together on Ugly Betty and ABC comedy Carpoolers.
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