Why was Sean Reagan recast in Boston Blue? Real reason explored

In October 2025, the premiere of the Boston Blue prompted much excitement among the fans of Blue Bloods, as they were happy to see Detective Danny Reagan (Donnie Wahlberg) back in action. However, much to the surprise of many people, his son on-screen, Sean Reagan, looked different. Having played the role for 14 seasons, Andrew Terraciano passed the role to Mika Amonsen in the spin-off.

Of course, people were curious about it, and social media was soon flooded with tweets and comments. Why then was Sean recast? Was it a creative consideration, a back-door problem, or otherwise? Let’s break it down.

Why Sean Reagan was recast for Boston Blue

The Boston Blue team claims that the recast was not personal; it was based on the story. Co-showrunner Brandon Margolis clarified that, though they were fond of Andrew Terraciano on Blue Bloods, the spin-off depicts Sean Reagan in a totally different phase of life. In Boston Blue, Sean is no longer a kid, but a rookie cop in the Boston Police Department, where he works with his father and is under the strain of the Reagan legacy.

In an interview with Variety, Brandon Margolis stated:

“We love Andrew and the work he did over the years on ‘Blue Bloods.’ 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 business as it were and is turning over this new leaf, but 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. It felt like there was an organic opportunity to bring in a new performance with a new energy, to help dramatize that change. It is the same character, it’s the same relationship, 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.”

The massive change not only increased the possibilities for the stories but also required new vitality and screen chemistry. The recast, in turn, is supposed to assist the character to coincide with this new chapter, the same Sean, only in a more adult role.

Andrew Terraciano’s reaction and life beyond Reagan

It is difficult for fans to accept that their beloved character is being recast; however, in a conversation with US Weekly, Andrew Terraciano said it was harder for him because it happened on the day he was graduating from college. For his family and him, it was a very emotional day. After all those years of acting as Sean, the role had become a large part of his life.

Nevertheless, Terraciano handled it gracefully. Terraciano thanked Blue Bloods for the opportunity and said that the memories he made and the efforts he gave are not diminished, just because someone else is going forward with the role. Terraciano also revealed that he had received a call from none other than Donnie Wahlberg himself because they’re still very much close and supportive of each other.

Fans, backlash, and new energy

Of course, the fans had a mixed reaction. Some were bewildered and dissatisfied that the Sean that they had grown up with would no longer be a part of the Boston Blue, while some were also open to the change. However, the cast change isn't all about erasing the past; it's all about how Sean would be featured as he progresses into a newer and more mature level.

The truth is, Amonsen has been very clear about how he is both apprehensive and honored to take on this new character and how viewers are gradually embracing his portrayal of Sean as a police recruit in Boston Blue.

Whether fans prefer the original or the new version, the change was a creative choice, not a controversy. The intention is to choose a person who represents Sean in his new form in Boston Blue and not his old self.

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