Boston Blue Recast Andrew Terraciano After Blue Bloods: Where Is He Now?

After playing Donnie Wahlberg‘s son Sean Reagan on Blue Bloods, Andrew Terraciano was recast in the Boston Blue spinoff — but where is the actor now?

Terraciano, 22, got his start on CBS’ Blue Bloods, appearing in nearly 300 episodes from 2010 to 2024. He also performed 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 eldest son, Jack Reagan. Despite becoming a beloved presence at the Reagan dinner table, the Blue Bloods spinoff, Boston Blue, premiered in October with Mika Amonsen now starring as Sean.

“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,” creator Brandon Margolis told Variety in October about the decision. “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 [of] a cop, which he’s never been before.”

Margolis called the switch “an organic opportunity to bring in a new performance with a new energy, to help dramatize that change.” The writers’ room was looking forward to “new storytelling lanes to explore” with the spinoff series.

“It is 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 great to watch it come to life.”

Andrew, who has yet to break his silence about the recasting, has kept “Sean Reagan on CBS’s Blue Bloods” in his Instagram bio. He took a social media break 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 at first. I felt the pressure to respect an actor before me because I wanted to respect Andrew the best 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 Terraciano’s take on the character.

“I really want to maintain Sean as close as I can in the ways that I do it 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 really quickly. It was within about a week’s time and I was really thrown into it quickly. I did binge watch as much as I could and I found doing the later seasons was more helpful. I wanted to get a sense of who Sean was toward the end of the show. I really wanted to get a sense of his character at that point into adulthood and his relationship with Danny.”

After rewatching key episodes of Boston Blue, Amonsen found ways to celebrate Terraciano’s performance.

“I wanted to respect Andrew’s portrayal of Sean as much as I could — but also adding something to my own version. The showrunners Brandon Sonnier and Brandon Margolis have been really good at giving me a lot of freedom to explore that new dynamic with Donnie,” he shared. “Watching 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 a bit comforting. I definitely kept that within myself and didn’t feel like I was obligated 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, it is 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 whole new position because from what I understand, the exploration of Sean being a cop wasn’t something that was on the table.”

Boston Blue airs on CBS Fridays at 10 p.m. ET.