**“Blue Bloods” Fans Finally Get Answers About Surprising Sean Reagan Casting Change in Spinoff “Boston Blue”**
Fans of the hit CBS series *Blue Bloods* are getting long-awaited answers about a casting change that caught many by surprise. The spinoff, *Boston Blue*, premiered on Friday, October 17, with viewers quickly noticing that Mika Amonsen had replaced Andrew Terraciano in the role of Sean Reagan.
Brandon Margolis, co-showrunner of *Boston Blue* alongside Brandon Sonnier, spoke candidly about the recasting decision in an interview with *Variety* published alongside the premiere episode.
“We love Andrew and the work he did over the years on *Blue Bloods*,” Margolis said of Terraciano, who was replaced back in July. “Really, it came down to we’re telling a new chapter in both of their lives.”
Margolis explained that the storytelling focus has shifted. “It’s not just Sean who has joined the family business, as it were, and is turning over this new leaf,” he noted, “but it’s also now Danny Reagan is the father to a cop, which he’s never been before.”
The co-showrunner further elaborated that the new narrative lanes presented “an organic opportunity to bring in a new performance with a new energy” to help dramatize this change. “It’s the same character, it’s the same relationship, but it’s also completely different,” he added. “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.”
In a separate interview with *TVLine* published on the same day, Margolis admitted he “loved” watching Terraciano “grow up on TV,” but emphasized that “creatively it made sense to find an actor with a different energy.”
“It was a gamble to open the show on a new face—actually two new faces—but the story required us to love him right away,” Margolis said. “Opening with that heroic moment that has a tragic end was the right way to pull Danny Reagan into this world.”
*Blue Bloods* first premiered on CBS in 2010 and aired for 14 seasons before concluding in December 2024. Terraciano, now 22, portrayed Sean Reagan, the son of Donnie Wahlberg’s character, Danny Reagan, in nearly every episode of the original series.
The spinoff *Boston Blue* was announced in February 2025 and follows Wahlberg’s character as he takes a position alongside his son with the Boston Police Department.
Donnie Wahlberg, 56, recently opened up about the new spinoff and his decision to reprise the role of Danny Reagan during a special screening and Q&A event for the premiere episode of *Boston Blue* held in New York City on Tuesday, October 14.
The *Wahlburgers* reality TV star revealed that the idea for the spinoff arose when two different concepts “bumped into” each other: one involved his character moving to Texas, and the other centered on a new law enforcement family based in Boston.
“I think they were like, ‘Hey, instead of moving to Texas, why don’t we talk about him joining this thing and moving to Boston?’” Wahlberg shared. “But I really didn’t think that would ever happen anytime soon. I was just chugging along in *Blue Bloods*.”
The *Sixth Sense* actor admitted he was initially hesitant to return but had a change of heart after learning more about the project.
“Suddenly it was like, ‘Do I really wanna do a spinoff?’ I didn’t know. And this idea was really good. And the script was really good,” he said. “I looked at it and I saw the possibilities of weaving the *Blue Bloods* world into it, and I saw a chance to play Danny in a different way.”
Wahlberg wasn’t fully on board with *Boston Blue* until he realized his onscreen son would also be a police officer, setting the spinoff apart with a distinct dynamic.
“That suddenly changed everything,” he explained. “Now there’s a whole new world.”
“It’s not only Danny with a new partner, meeting this new family,” Wahlberg continued. “It’s Danny being a dad and worrying about his son, making sure he gets home safe every day and teaching him the job, the way that his family taught him the job.”
*Boston Blue* airs Fridays at 10 p.m. on CBS.
https://nypost.com/2025/10/20/entertainment/boston-blue-showrunner-explains-decision-to-recast-sean-reagan/
