CBS is expanding the Blue Bloods universe with its Boston Blue spinoff - but who makes up the cast? Blue Bloods, which premiered in 2010, followed the lives of the Reagan family, many of whom worked for the NYPD under the leadership of NYC police commissioner Frank Reagan (Tom Selleck).

Boston Blue is expanding its family with Psych alumna Maggie Lawson, who has joined CBS’ Blue Bloods spinoff, our sister site Deadline reports. In the offshoot, Donnie Wahlberg reprises his role as NYPD Officer Danny Reagan as he makes the move to the Boston Police Department,

Green in the next chapter of the "Blue Bloods" story.Boston P.D. has found its new Superintendent.Psych star Maggie Lawson is that latest addition to the growing cast of Boston Blue, CBS' planned spinoff of Blue Bloods.