Boston Blue, the Blue Bloods spin-off centred on Danny Reagan, will bring back veteran cast member Len Cariou as family patriarch Henry Reagan when its second season begins on CBS. His return, along with newly released plot details, comes almost two years after Blue Bloods ended its 14-season, 293-episode run in December 2024, and reinforces the new show's ties to the original series as it heads into its sophomore outing.

Boston Blue Season 2 premieres on 9 October 2026 with an episode titled "The Crash," in which Danny and Lena (Sonequa Martin-Green) investigate a copycat killer mimicking the Boston Strangler murders, aided by Henry Reagan and rookies Jonah and Sean. CBS has also confirmed the returns of Wahlberg and Martin-Green, with Lena having recovered from the gunshot wound sustained in the Season 1 finale, while the fate of Detective Brian Rodgers, left for dead in a river in that finale, remains unresolved as the investigation into his attack continues alongside a career-defining promotion for Danny.