News - Why was the Blue Bloods spin-off 'Boston Blue' recasting the role of Sean Reagan?

Brandon Margolis expanded on the new storytelling requirements of "Boston Blue" in an interview with Variety, where he spoke about Sean Reagan becoming a cop being a major factor in his and the producers' decision to recast the character. "It's not just Sean who has joined the family business as it were and is turning over this new leaf," he said. "It's also now Danny Reagan is the father to a cop, which he's never been before. So there are all these new storytelling lanes to explore." According to Margolis, this provided an "organic opportunity" for "a new energy" that could help emphasize the change. "It is the same character, it's the same relationship," he added. "But it's also completely different. We love what Mika has brought to Sean: this vulnerability, yet this desire to prove himself. It's just been great to watch it come to life." It's not entirely clear why Sean's becoming a cop necessitated a new actor, but it seems the showrunners were convinced it did, regardless. There may well be several other behind-the-scenes reasons for the recasting, but thus far, there's been no confirmation of anything. Meanwhile, Andrew Terraciano has yet to directly address the recasting. The last "Blue Bloods"-related update from the actor came in December 2024 when he made an Instagram post celebrating the series finale. Otherwise, the actor has been busy graduating from New York University in 2025, with his former co-star Donnie Wahlberg congratulating him on a separate Instagram post. Elsewhere, it seems Tom Selleck is eager to team up with "Yellowstone" creator Taylor Sheridan, so if that ever comes to fruition, perhaps Terraciano can come on board as a similarly jilted ex-"Blue Bloods" actor.