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

Donnie Wahlberg’s character from the crime procedural, Danny Reagan, will be returning along with his son, Sean Reagan. However, Andrew Terraciano, who played Sean during all 14 seasons of Blue Bloods, will no longer be portraying the character.