Mika Amonsen has joined the cast of CBS’ ‘Blue Bloods’ spinoff ‘Boston Blue,’ playing the younger son of Donnie Wahlberg’s character, Danny Reagan.

Mika Amonsen has been cast as Sean Reagan on Boston Blue opposite Donnie Wahlberg. On Blue Bloods, Sean was played by Andrew Terraciano.

Mika Amonsen has joined the CBS drama in a series regular role playing the youngest son of Donnie Wahlberg’s character, Danny Reagan. Andrew Terraciano portrayed Sean in 292 of the 293 ...