In July 2025, PEOPLE confirmed that Andrew Terraciano would not return as Sean Reagan, Danny Reagan’s son (Donnie Wahlberg), in CBS’s new Blue Bloods spinoff Boston Blue.
Terraciano portrayed Sean for 14 seasons (2010–2024), so the recasting surprised many fans. Ahead of the show’s October 17, 2025 premiere, co-showrunner Brandon Margolis told TVLine that Mika Amonsen was brought in for the role.
“We loved Andrew’s work and watching him grow up on screen,” Margolis said. “But as we moved into a new chapter for the character, it made creative sense to go in a different direction.”
He later explained to Variety that the recast was strictly a creative decision.
In Boston Blue, Sean is reintroduced as a patrolman in the Boston Police Department, working alongside his father Danny, who has also relocated to Boston. The new setup shifts the story into a fresh phase of their relationship, focusing on both family ties and life on the job in a new city.