Credit: Evan Agostini/Getty Images Photo: Tim Guinee at the Premiere of Broken English at the Landmark Sunshine Cinema on June 18, 2007 in New York City

Castle is packing in the guest stars like crazy in Season 4, and the trend will continue when The Good Wife's Tim Guinee joins the cast for Episode 19, "47 Seconds."

As we learned last week, "47 Seconds" is about a bombing that takes place during an Occupy Wall Street-style protest in New York City.

According to, Tim Guinee will play an anti-Wall street activist who witnesses the bombing, and presumably becomes a crucial part of Castle and Beckett's investigation.

No official air date yet, but we're guessing mid-March, as Castle goes on a brief hiatus after Episode 17, "Once Upon a Crime," on February 27.


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