“Blue Bloods” fans are finally getting answers about one casting change that came out of the blue.

The hit CBS show’s spinoff, “Boston Blue,” premiered on Friday, Oct. 17, and viewers were quick to notice that the original actor who played Sean Reagan, Andrew Terraciano, was replaced by Mika Amonsen.

Brandon Margolis, who serves as co-showrunner of the new series alongside Brandon Sonnier, opened up about the decision during an interview with Variety published alongside the premiere episode of “Boston Blue.” 11

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“We love Andrew and the work he did over the years on ‘Blue Bloods,'” Margolis said of Terraciano, who was replaced by Amonsen back in July. “Really, it came down to we’re telling a new chapter in both of their lives.”

“It’s not just Sean who has joined the family b

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