Sonequa Martin-Green has been cast in “ Boston Blue ” (working title), CBS ‘ upcoming spinoff of “Blue Bloods.” She will play detective Lena Peters, the eldest daughter of a prominent law enforcement family, who is partnered with Danny Reagan (Donnie Wahlberg reprising his “Blue Bloods” role).

It’s official – we finally know who will play Danny Reagan’s new partner in the Blue Bloods offshoot series, Boston Blue! The announcement was made by CBS along with a series of release dates, lineup changes and exciting shows to come. On Wednesday, May 7, it was announced that Sonequa Martin-Green will be portraying Danny’s...