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

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.

Donnie Wahlberg Celebrates ‘New Chapter’ at First 'Boston Blue’ Table Read originally appeared on Parade. Donnie Wahlberg celebrated the official start of the Blue Bloods spinoff, Boston Blue, by sharing a photo from the first table read.