Why was Andrew Terraciano recast as Sean in Boston Blue?

The recasting was a creative decision by the showrunners to bring a different energy to Sean's character for a new chapter in his life.

What is the new dynamic between Sean and Danny in Boston Blue?

For the first time, Sean and his father Danny are serving together as patrolmen in the Boston Police Department.

How did fans react to the Sean recasting on Boston Blue?

Fan reactions were mixed, with some expressing sadness over the change and others praising the new father-son storylines.

Home / Arts and Entertainment / Sean Recast Shakes Up Boston Blue Legacy

Sean Recast Shakes Up Boston Blue Legacy

2 Dec, 2025

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Summary

Andrew Terraciano recast as Sean after 14 seasons.
New actor Mika Amonsen brings fresh energy to Sean's role.
Sean and his father Danny now serve in the same Boston police department.

Sean Recast Shakes Up Boston Blue Legacy

Andrew Terraciano, who portrayed Sean on Blue Bloods for 14 seasons, has been recast in the new series Boston Blue, with Mika Amonsen stepping into the role. Co-showrunner Brandon Margolis stated the recasting was a creative choice to capture a new energy for the character as he enters a fresh chapter.

Boston Blue introduces significant changes, with Sean now a patrolman in the Boston Police Department. Adding to the new dynamic, his father, Danny, also joins the Boston force, marking the first time they serve together in the same department. This setup allows for explorations of family life and police work side-by-side.

While some fans expressed disappointment over the recasting, many are embracing the new father-son interactions. Amonsen acknowledged the pressure but aims to honor Terraciano's portrayal while bringing his own energy to the beloved character. Terraciano appeared content to have concluded his journey as Sean.