Mika Amonsen will play Sean Reagan in the 'Blue Bloods' spinoff, 'Boston Blue,' a role previously played by Andrew Terraciano ...

Andrew Terraciano will not return as Sean Reagan in the spinoff, and Mika Amonsen will now take his place in 'Boston Blue' ...

Terraciano, 22, appeared in all but one of the 293 episodes of the primetime network show Blue Bloods. Siblings Sean and Jack ...

Danny Reagan’s youngest son Sean will look a little different when he appears alongside his dad on CBS’ upcoming drama series ...

Boston Blue recasting Sean is a major change that is a good news/bad news situation for fans of the original Blue Bloods ...

The forthcoming CBS procedural Boston Blue may be a spin-off from Blue Bloods, but it's still making a distinct departure ...

CBS caused a stir earlier this year when it revealed that Boston Blue, a spin-off of Blue Bloods, was in the works.

Blue Bloods' Sean Reagan has been recast for the upcoming spin-off series Boston Blue. Andrew Terraciano played Sean through ...

Mika Amonsen will replace Andrew Terraciano, who played Sean Reagan throughout the 14-season run of "Blue Bloods." ...

CBS’ upcoming Blue Bloods offshoot has added another Reagan — though he will look a bit different when he shows up. A ...

Blue Bloods is known for keeping it all in the family — therefore, it is only fitting that Andrew Terraciano maintains an important familial connection even while on the set. In fact, the young ...

Andrew Terraciano as Sean Reagan on ‘Blue Bloods’ | Photo by Patrick Harbron/CBS via Getty Images. Blue Bloods started back in 2010 and Terraciano has played Sean Reagan since then.