After playing Donnie Wahlbergs son Sean Reagan on Blue blood, Andrew Terraciano was recast in Boston blue spinoff — but where is the cast now?
Terraciano, 22, joined CBS Blue bloodappeared in nearly 300 episodes from 2010 to 2024. He also appeared in several short films – and wrote one himself – while attending New York University.
Andrew’s role as Sean allowed him to share the screen with brother Tony Terraciano, who played Donnie’s oldest son, Jack Reagan. Despite becoming a beloved presence at the Reagan dinner table, Blue blood by-product, Boston bluepremiered in October with Mika Amonsen now starring as Sean.
“We love Andrew and the work he’s done over the years on Blue Bloods. It really came down to us telling a new chapter in both of their lives,” the creator Brandon Margolis told Amount in October about the decision. “It’s not just Sean joining the family business as it were and turning over this new leaf, but it’s also now that Danny Reagan is the father (of) a police officer, which he’s never been before.”
Margolis called the switch “an organic opportunity to bring in a new show with new energy, to help dramatize that change.” The writer’s room looked forward to “new narrative paths to explore” with the spinoff series.
“It’s the same character, it’s the same relationship, but it’s also completely different,” he continued. “We love what Mika has brought to Sean, this vulnerability, yet this desire to prove himself. It’s just been amazing to see it come to life.”
Andrew, who has yet to do so break their silence about the recasthas kept “Sean Reagan on CBS’s Blue Bloods” in his Instagram bio. He took a break from social media before returning in November to share photos of him and his friends.

While Andrew hasn’t shared many updates on social media, Amonsen showed support for his predecessor.
“I definitely felt a ton of pressure in the beginning. I felt the pressure to respect an actor before me because I wanted to respect Andrew as much as I could,” Amonsen recalled. “There were even certain visual choices that I made that I wanted to keep in terms of hair styling and certain ways of being (as Sean).”
Amonsen wanted to pay tribute to Terracianos get into character.
“I really want to keep Sean as close as I can in the way I do out of respect for this character that everyone loves — but also the character Andrew built,” he continued. “When I booked the show, it all happened very quickly. It was within about a week and I was really thrown into it quickly. I watched it a lot as much as I could and I thought it was more useful to do the later seasons. I wanted to get a sense of who Sean was towards the end of the show. I really wanted to get a sense of his character at that point in adulthood and his relationship with Danny.”
After re-watching important episodes of boston blue, The Ammons found ways to celebrate Terraciano’s appearance.
“I wanted to respect Andrew’s portrayal of Sean as much as I could — but also add something to my own version. Showrunners Brandon Sonnier and Brandon Margolis have been really good at giving me a lot of freedom to explore the new dynamic with Donnie,” he shared. “When I saw Andrew’s performance, I actually noticed a lot of similarities just between us as people and our energy. It’s quite upbeat. I have a lot more of an upbeat energy myself. So that was kind of comforting. I definitely kept that within myself and didn’t feel like I had to change that part of me — which was nice — in terms of making it my own.”
Amonsen concluded, “We’re really just exploring what would have been. Of course, that’s my own version of it, but at the same time, we haven’t seen this relationship with Sean and his dad before. He’s coming into this new position because, from what I understand, exploring Sean as a cop wasn’t something that was off the table.”
Boston blue airs on CBS Fridays at 10 p.m. ET.




