‘Boston Blue’: Why Mika Amonsen Replaced Andrew Terraciano as Sean Reagan

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Boston Blue launched on Friday, October 17, 2025 (10/9c), and immediately ignited debate across the Blue Bloods universe for one reason: the series recast Sean Reagan. Mika Amonsen now plays Sean, taking over for Andrew Terraciano after 14 years. Co-showrunner Brandon Margolis describes the choice as part of a new phase for both father and son, with Sean now a Boston Police Department rookie and Danny Reagan adjusting to being “the father to a cop.”

Why Sean Reagan was recast

Margolis lays out the creative rationale in detail. “We wanted a slightly different version of Sean,” he explains, emphasizing that the team aimed for familiarity while making room for growth once Sean joined the force.

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