After more than a decade of playing the sharp and principled Assistant District Attorney Erin Reagan on Blue Bloods, actress Bridget Moynahan is officially making the leap into familiar — yet brand-new — territory. CBS has confirmed that Moynahan will appear in the premiere episode of Boston Blue, the highly anticipated spinoff of the long-running police drama.
A Seamless Transition Between Universes
Boston Blue is being developed as a fresh but connected story within the Blue Bloods universe. Set in Boston — Donnie Wahlberg’s real-life hometown — the new series promises to explore law enforcement from a grittier, more street-level perspective, while still maintaining the character-driven storytelling that made Blue Bloods a fan favorite.
Moynahan’s appearance in the pilot episode is expected to serve as a narrative bridge between the two shows. While CBS has not revealed full plot details, early reports suggest that her character Erin Reagan will play a brief but meaningful role, potentially setting up a larger crossover arc or providing institutional support for the new characters introduced in Boston Blue.
A Welcome Familiar Face
For longtime fans, Moynahan’s return — even in a guest role — brings continuity and excitement. Her portrayal of Erin Reagan over 14 seasons helped define Blue Bloods‘s unique tone: a balance between family loyalty, professional ethics, and personal sacrifice. Her involvement in Boston Blue adds credibility to the spinoff and may even signal future appearances, depending on how the story evolves.
This news comes just weeks after Donnie Wahlberg teased that Boston Blue would be “more grounded, more raw, and more personal” than its predecessor, and that while it honors the Blue Bloods legacy, it aims to create its own identity.
What to Expect from Boston Blue
Boston Blue will reportedly follow a team of officers and detectives navigating the unique social, political, and cultural dynamics of modern-day Boston. Wahlberg, who also stars in Blue Bloods as Detective Danny Reagan, serves as executive producer, and has hinted at cameos and crossover potential with the original series.
Filming for the pilot took place earlier this summer in various Boston neighborhoods, with the city itself expected to play a prominent role — almost like a character of its own.
A Promising Start
Moynahan’s participation in the premiere is being seen as a sign that CBS is investing in Boston Blue not just as a procedural drama, but as an extension of a beloved television legacy. Whether Erin Reagan’s appearance is a one-time cameo or a setup for future involvement, fans of the Blue Bloods universe have something to look forward to when Boston Blue debuts.a
