Donnie Wahlberg on “Boston Blue” and the return of Danny Reagan

For 14 years, Donnie Wahlberg starred as NYPD detective Danny Reagan on CBS’ “Blue Bloods.” Now, in the spinoff series “Boston Blue,” his character patrols the streets of Wahlberg’s own hometown. He talks with Mo Rocca about growing up in Boston; being a member of the boy band New Kids on the Block; and why he decided to bring his character back.