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Danny Reagan is back on the case. 

Blue Bloods spinoff Boston Blue premieres October 17 on CBS. The new show focuses on the NYPD detective played by Donnie Wahlberg as he takes a new job with the Boston Police Department. What prompted the move to Massachusetts? Danny is following in the footsteps of his son, Sean Reagan, who is beginning his own career in Boston. 

In addition to Wahlberg, Boston Blue will also feature an appearance from Blue Bloods cast member Bridget Moynahan. Wahlberg has hinted that other Blue Bloods stars might also pop up on Boston Blue. But one face won’t look familiar. The role of Sean Reagan has been recast. Andrew Terraciano played the character on Blue Bloods, but Sean will be portrayed by Mika Amonsen in Boston Blue. 

Who is Mika Amonsen from ‘Boston Blue’?

'Boston Blue' cast members standing around a dinner table
(L-R): Ernie Hudson as Reverend Peters, Sonequa Martin-Green as Lena Silver, Donnie Wahlberg as Danny Reagan, and Mika Amonsen as Sean Reagan in ‘Boston Blue’ | Christos Kalohoridis/CBS ©2025 CBS Broadcasting, Inc. All Rights Reserved.
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Amonsen is a Canadian actor who was raised and still lives in Toronto. (Boston Blue films in Canada’s largest city as well as Boston.) 

Prior to joining the new CBS series, Amonsen appeared in the Prime Video series Reacher and the horror film Thanksgiving. He’ll also bee seen in the upcoming move Whistle. Other roles includes Pachinko, The Republic of Sarah, Murdoch Mysteries, and Hudson & Rex. 

In addition to acting, Amonsen is a musician who performed as the lead guitarist of a Toronto-area rock band. He was raised just outside Toronto and continues to reside there today.

Boston Blue airs Fridays at 10 p.m. ET/PT on CBS. Episodes also stream on Paramount+.

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