Bridget Moynahan stepped back into Erin Reagan's shoes when her nephew Sean was admitted to the hospital, leaving flowers by his bed and remaining until she knew Danny had stabilized. Len Cariou brought Henry Reagan back for the first season, with the appearance announced in January 2026 and airing in April. He returned once more for the second-season opener in October 2026, catching up with his great-grandson and reconnecting with former colleagues on the Boston force.
Will Estes joined for one episode in November 2026, arriving after his promotion to lieutenant in New York. The brothers argue in their typical style yet collaborate on an investigation, make peace, and close the hour sharing a meal with the Silver family.
Boston Blue continues to air Fridays at 10 p.m. ET on CBS.