When CBS officially unveiled Boston Blue the highly anticipated successor to Blue Bloods 
fans were thrilled to see the Reagan legacy continue. But excitement quickly turned into debate after the network confirmed one major change: the role of Sean Reagan had been recast. Mika Amonsen, stepping in to play Danny Reagan’s youngest son, soon found himself at the center of the franchise’s first real controversy.
For fourteen seasons, viewers watched Andrew Terraciano grow up on screen as Sean. His portrayal became a beloved constant throughout Blue Bloods’ run, making the decision to introduce a new actor a bold and risky move. Predictably, longtime fans had strong feelings.
Amonsen is well aware of the mixed reaction.
“There’s definitely been some negativity,” he told Us Weekly, acknowledging the initial pushback. “But for every critical comment, there’s someone encouraging me, appreciating my take on Sean, and embracing what we’re doing with the character.”
Stepping into the Reagan family wasn’t something Amonsen took lightly. Blue Bloods wasn’t just a procedural it was a multi-generational family story. Danny, Linda, Jack, and Sean were core pillars of the series, and audiences formed deep connections with them over the years. Terraciano’s evolution from child actor to young adult made his version of Sean feel especially personal to fans.
So when Boston Blue brought Sean into a new phase of life older, more independent, and starting over with his father in Boston Amonsen felt the pressure immediately.
“I felt a huge responsibility,” he admitted. “I really wanted to honor Andrew’s work. There were even subtle things certain gestures, the way Sean carries himself that I tried to preserve because fans associate those traits with him.”
But he also knew he couldn’t simply mimic what came before. Boston Blue represents a fresh chapter, not a replica of the original series. Sean isn’t a kid anymore, and the world around him has changed.
“I want to keep the essence of who Sean is,” Amonsen said. “But this version is stepping into adulthood taking on new challenges, facing new emotional terrain. That’s something the original show didn’t have space to explore, and it gives me room to grow with the character.”
As Boston Blue cements itself as the next evolution of the Reagan saga, the recasting that once sparked backlash now feels more like a natural progression. Terraciano’s portrayal remains deeply valued, but Amonsen is carving out his own meaningful place in the franchise.
“Ultimately,” he said, “my goal is to respect what came before while helping Sean become the man he’s meant to be.”