‘Boston Blue’ Recasts Sean Reagan: Mika Amonsen Takes Over Role in ‘Blue Bloods’ Spinoff

Although “Boston Blue” is a direct offshoot of “Blue Bloods,” the Reagan family will look a bit different this time around. Mika Amonsen has joined the CBS drama in a series regular role playing the youngest son of Donnie Wahlberg’s character, Danny Reagan.

Andrew Terraciano portrayed Sean in 292 of the 293 episodes of “Blue Bloods.”

Per CBS, in the new series, Sean has “relocated to Boston to start a new chapter as a Boston PD patrolman. Sean committed himself to pursuing his family’s legacy but wanted to do so on his own terms, which meant joining a department outside of his hometown. Danny’s decision to stay in Boston gives this father and son duo a chance to reconnect on a deeper level.”

Amonsen has appeared in “Reacher” for Prime Video and starred in Eli Roth’s “Thanksgiving.”

The series is set to be an expansion of the “Blue Bloods” universe with Wahlberg leading as Det. Danny Raegan. Now relocated to Boston, he’s partnered with Detective Lena Silver, played by Sonequa Martin-Green, the oldest daughter of a prominent law enforcement family.

Other cast members in include Maggie Lawson as Sarah Silver, Marcus Scribner as Isaiah Silver, Gloria Reuben as Mae Silver and Ernie Hudson as Reverend Peters.

The series is set to premiere on CBS this fall in the “Blue Bloods” slot, Fridays at 10 p.m.

“Boston Blue” is produced by CBS Studios in association with JBTV. Brandon Sonnier and Brandon Margolis will showrun and executive produce. Jerry Bruckheimer, KristieAnne Reed and Wahlberg serve as executive producers.