Fan-Favorite 'Blue Bloods' Actor Recast for 'Boston Blue'

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Fan-Favorite 'Blue Bloods' Actor Recast for 'Boston Blue' originally appeared on Parade.

When Blue Bloods’ Danny Reagan (Donnie Wahlberg) moves to Boston in the CBS spinoff Boston Blue, he won’t be the only Reagan making the move. His youngest son Sean, who has been played by Andrew Terraciano throughout the series’ 14-season run, has been recast. The role of Sean Reagan will now be played by Mika Amonsen.

Mika Amonsen(Photo by VALERIE MACON/AFP via Getty Images

Per CBS, Sean has “relocated to Boston to start a new chapteras 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 relocate to Boston gives this father and son duo a chance to reconnect on a deeper level.”

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Deadline was first to report the news, which helps explain why Danny would give up his detective job at the NYPD to start fresh in Boston.

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In Boston Blue, Danny Reagan moves from New York City to Boston, where he is hired into a position with the Boston PD. Once in Beantown, he is paired with Detective Lena Peters (Sonequa Martin-Green), the eldest daughter of a prominent law enforcement family.

Related: Blue Bloods Star Donnie Wahlberg Talks Whether Tom Selleck Could Be a Part of Boston Blue (Exclusive)

In addition to Det. Lena Silver, the series will star Mae Silver (Gloria Reuben), Lena’s mother, and Boston’s District Attorney and the widow of a judge. Her stepsister Sarah (Maggie Lawson) is the Police Superintendent, and her brother Jonah (Marcus Scribner) is a rookie cop.

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Boston Bluewill premiere on CBS this fall, Fridays at 10 p.m. ET/PT, in the formerBlue Bloodstimeslot.

Next, CBS Announces New Casting for Blue Bloods Offshoot Boston Blue Starring Donnie Wahlberg

Fan-Favorite 'Blue Bloods' Actor Recast for 'Boston Blue' first appeared on Parade on Jul 10, 2025

This story was originally reported by Parade on Jul 10, 2025, where it first appeared.