CBS later announced that a spinoff titled Boston Blue was ordered straight to series and would expand the universe with Wahlberg’s character. The actor hasn’t ruled out appearances from his former onscreen family members — with Moynahan the first to be confirmed.

Mika Amonsen will replace Andrew Terraciano, who played Sean Reagan throughout the 14-season run of "Blue Bloods."Though Donnie Wahlberg is the only member of the core Blue Bloods cast set to return for the long-running series' first spinoff,

Bridget Moynahan will guest star as Erin Reagan in the premiere of 'Boston Blue,' a spinoff of 'Blue Bloods,' alongside Donnie Wahlberg. The show shifts to Boston, introducing new characters, including a recast Sean Reagan,