Boston Blue‘s Mika Amonsen has seen the Sean Reagan backlash after he was cast in the Blue Bloods spinoff in place of Andrew Terraciano.
“There’s been some negativity, for sure,” Amonsen exclusively told Us Weekly about taking over the role of Donnie Wahlberg‘s onscreen son. “But when I look under those posts that have the negativity, there’s a lot of fans rallying for Sean and people saying that they really enjoyed this character that I’ve created — or my version of character.”
Amonsen noted that he wanted to make Blue Bloods fans happy with his performance, saying, “They’re really enjoying the show and they love where it’s going in terms of Sean and that makes me happy.”
Sean was originally introduced on Blue Bloods, which aired from 2010 to 2024 and followed the lives of the Reagan family. Wahlberg’s fan-favorite character Danny was previously married to Linda Rose Reagan (Amy Carlson), with whom he shared sons Jack and Sean, before her death. The role of Danny’s youngest son was played by Terraciano for the entirety of the show’s 14 seasons.
After Blue Bloods came to an end in 2024, CBS announced a spinoff titled Boston Blue. Amonsen was subsequently added to the cast as Sean.
“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].
Christos Kalohoridis/CBS ©2025
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.
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“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.
