The highly anticipated Blue Bloods spinoff Boston Blue is already making waves — and it hasn’t even premiered yet. CBS has officially confirmed that the role of Sean Reagan, the son of Detective Danny Reagan (played by Donnie Wahlberg), has been recast after being portrayed by Andrew Terraciano for a remarkable 14 seasons on the original series.
👨👦 A Major Shift for a Familiar Character
Andrew Terraciano began playing Sean Reagan at the age of six, growing up on-screen as part of the beloved Reagan family. His portrayal became a steady presence in Blue Bloods, known for the character’s intelligence, moral compass, and his close bond with his father, Danny.
However, in Boston Blue, CBS has opted for a new direction. The recast brings in Kaitlyn Maher, reimagining Sean as Grace Reagan, Danny’s daughter in this new timeline — signaling a fresh take on the family dynamic.
“We wanted Boston Blue to stand on its own while honoring the legacy of Blue Bloods,” said executive producer Kevin Wade. “By evolving the Reagan family story, we open the door to new emotional layers and modern storytelling.”
🔄 From Sean to Grace: A Bold Narrative Choice
Instead of continuing with Sean Reagan as a supporting character, Boston Blue introduces Grace Reagan, a now-grown daughter of Danny who is navigating early adulthood and studying law — a clear nod to the family’s tradition of public service.
Casting Kaitlyn Maher, best known for her dramatic work on Law & Order: New Docket, is seen as a strategic move to both modernize and diversify the next generation of Reagans.
“Grace is driven, idealistic, and she challenges Danny in ways Sean never did,” Maher said in an interview. “There’s a lot of love there, but also a generational clash that feels real and timely.”
👥 Why the Change?
CBS has not provided a specific reason for recasting the role, but industry insiders suggest that creative direction played a key role. The writers were looking to explore new family dynamics and saw an opportunity to add fresh energy to the show by introducing a daughter-father relationship instead of maintaining the father-son bond.
Andrew Terraciano, who has taken a step back from acting to pursue college and personal projects, has not publicly commented on the change.
🔮 What This Means for Boston Blue
The recasting is part of a broader strategy by CBS to reimagine parts of the Blue Bloods universe while keeping familiar elements. Donnie Wahlberg’s return as Danny Reagan provides continuity, while the Boston setting and new characters promise something different.
Alongside Maher, the series also stars Zoe Saldaña, Jovan Adepo, and a guest appearance by the late Lance Reddick, in one of his final filmed roles.
📺 Final Thoughts
While the decision to recast Sean Reagan might come as a surprise to long-time Blue Bloods fans, it reflects the show’s commitment to growth and reinvention. With a fresh cast and a bold new setting, Boston Blue is shaping up to be more than just a spinoff — it’s a reinvention of a modern TV classic.
