When does Bridget Moynahan return as Erin Reagan in Boston Blue?

Return Details

Bridget Moynahan returned as Erin Reagan in Boston Blue's Season 1, Episode 17, which aired on Friday, May 1, 2026. The episode was titled 'L'dor Vador' and featured her as a returning guest star alongside Donnie Wahlberg's Danny Reagan character.

Episode Plot

In the episode, Danny and Erin work together to take down a serial killer and rescue his latest victim. During their investigation, the killer attempts to drive a wedge between the siblings by needling Danny about his move to Boston and exposing Erin's reservations about his departure from New York. The episode culminates with Danny accompanying Erin back to New York City for a Reagan family dinner.

Emotional Conflict

Erin's return reveals family tensions surrounding Danny's relocation to Massachusetts for Boston Blue. While she initially claimed the family was fine with his move, the investigation exposes her mixed feelings. During their drive to New York, Erin insists she was only telling the killer what he wanted to hear, though she is not especially convincing. She notes that everyone will be thrilled to see Danny at dinner, at least for one Sunday, suggesting he has not returned since his departure in the pilot episode.