Len Cariou, Bridget Moynahan to Guest Star on "Boston Blue"

Donnie Wahlberg confirms appearances by two "Blue Bloods" veterans on the new spin-off series.

Jan. 27, 2026 at 7:15pm

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Len Cariou, who plays Henry Reagan on "Blue Bloods", will guest-star in Episode 13 of the new CBS spin-off series "Boston Blue" in April. Bridget Moynahan, who also stars on "Blue Bloods", will make her second appearance on "Boston Blue" in Episode 17 airing in May. The news was confirmed by series star Donnie Wahlberg during a virtual panel hosted by the Television Critics Association.

Why it matters

The appearances of Cariou and Moynahan, who are both veteran cast members of the long-running "Blue Bloods" series, will help establish connections between the two shows and draw in loyal viewers of the original series to the new spin-off.

The details

Cariou will guest-star in Episode 13 of "Boston Blue" in April, while Moynahan will appear in Episode 17 airing in May. This will mark Cariou's first appearance on the spin-off, reuniting him with co-star Wahlberg, who plays his on-screen son. Moynahan previously appeared in the pilot episode of "Boston Blue".

  • Cariou will guest-star in Episode 13 airing in April.
  • Moynahan will appear in Episode 17 airing in May.

The players

Len Cariou

An actor who plays Henry Reagan, the patriarch of the Reagan family, on the CBS series "Blue Bloods".

Bridget Moynahan

An actress who plays Erin Reagan, the daughter of the Reagan family, on the CBS series "Blue Bloods".

Donnie Wahlberg

An actor who plays Danny Reagan, the son of the Reagan family, on the CBS series "Blue Bloods" and is also a star of the new spin-off series "Boston Blue".

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What they’re saying

“Len Cariou will guest-star in Episode 13, airing in April, while Bridget Moynahan will appear in Episode 17, airing in May.”

— Donnie Wahlberg, Actor (Television Critics Association panel)

The takeaway

The appearances of veteran "Blue Bloods" cast members Len Cariou and Bridget Moynahan on the new spin-off series "Boston Blue" will help establish connections between the two shows and draw in loyal viewers of the original series.