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

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,

Donnie Wahlberg is the new kid on the block in the new Blue Bloods spinoff series, which sees Danny Reagan go to Boston, and they have officially had their first table read. Wahlberg shared a photo of the very first script from his new show,