One of the biggest surprises in the development of Boston Blue was the announcement that the role of Sean Reagan, Danny’s younger son, would be recast. After years of being portrayed by Andrew Terraciano on Blue Bloods, the character will now be played by actor Mika Amonsen.
Producers explained that the recasting was part of the creative decision to reinvent the character for the new series. With Sean now entering adulthood and preparing for a career in law enforcement, the writing team wanted to establish a version of the character capable of carrying heavier storylines. They emphasized that a fresh interpretation would help differentiate Boston Blue from the original show rather than simply replicating it.
According to early reports, Sean’s arc will focus on his early steps within the Boston Police Department, navigating the expectations associated with the Reagan name while trying to build an identity of his own. Writers intend to explore generational conflict, personal ambition, and the struggle of living up to a family legacy — themes that echo the original show while allowing new depth.
The recasting decision drew mixed reactions from longtime fans of Blue Bloods. Some expressed disappointment at losing the original actor, who grew up on-screen over the course of fourteen seasons. Others felt optimistic, recognizing that a new series in a new city could benefit from a reinvention of the character.
The actor stepping into the role has discussed his preparation process, including studying Terraciano’s portrayal while bringing his own interpretation. He noted that understanding Sean’s emotional history was key, but that the new show would challenge the character in ways that Blue Bloods never explored.
As anticipation builds for the series premiere, the evolution of Sean Reagan stands as one of the most intriguing elements of Boston Blue. Whether the recast strengthens the story remains to be seen, but it undoubtedly marks a turning point in the expanding Reagan universe.
