Assistant District Attorney Erin Reagan is Frank Reagan’s only daughter. She is portrayed by Bridget Moynahan. A New York County Assistant District Attorney and single mother, Erin is the second child and only daughter of the current New York City Police Commissioner Frank Reagan and his wife Mary. She grew up in Bay Ridge, Brooklyn, with three brothers, Danny, Joe, and Jamie. It is implied throughout the series that she had something of a wild streak growing up (unlike her daughter). In season 5, it is mentioned that she graduated top of her class from Columbia University. She later went on to attend Fordham University School of Law.[11] In season 6, Erin celebrated her 40th birthday.[12]
Erin is divorced from John “Jack” Boyle (Peter Hermann), a criminal defense attorney, whom she met when they were 19. Daughter Nicky is the couple’s only child. In “Old Wounds”, she finally changes her name from Erin Reagan-Boyle back to Erin Reagan.[13] Since her divorce, Erin has had a few romantic interests. She and her boss, District Attorney Charles Rosselini (Bobby Cannavale), flirted with each other and even shared a kiss after a date, but nothing ever came of it mainly due to Erin’s reluctance with the idea of dating her boss. In 2011, she met Jacob Krystal (Fred Weller) at an art gallery; she later learned that he was an art thief who returned once-stolen works to their rightful owners, and he left town. In 2013, after being shot in a courtroom hostage situation, she began dating her ex-husband Jack, but eventually broke up with him when she realized Jack only wanted to date and that he didn’t want a serious commitment. In 2014, Erin met Robert McCoy, a defense attorney, on a speed-date, and the two became romantically involved until he was appointed interim District Attorney, at which point she said she can’t sleep with her boss.
Erin is almost raped and killed in “Re-Do”, though Frank saves her life by shooting her attacker dead.[14] In “To Protect and Serve”, Erin is taken hostage and shot in the arm at the courthouse. She is saved by Danny after he says a coded message, “Please, don’t hurt my family,” after which she dropped to the ground, and Danny shot her assailant. It is revealed that their father taught them this when they were young, as a plan in case one of them was ever held at gunpoint.[15]
In “Working Girls”, Erin is offered the position of Deputy Mayor of Operations by Mayor Poole, but she turns him down.[16] In “Ends and Means”, Erin is promoted from Senior Counsel to Deputy Bureau Chief of the Trial Bureau.[17] In the season four finale, she filed a complaint against her boss, Bureau Chief Amanda Harris, upon learning she had abused her power.[18] In season six, Erin was considered for a judgeship.[19] Erin is on the short list to become District Attorney in the season 11 episode “In the Name of the Father”, after her boss, DA Samar Chatwell, is arrested on corruption charges. While Erin is on the short list to be named Acting DA by the governor, the governor ultimately chooses the then-Acting DA for Fulton County, Georgia (Atlanta) for the job.[2]
Like the rest of her family, Erin is licensed to carry a firearm. Her weapon of choice is the Glock 19 in 9×19mm, and according to Frank, she’s a better shot than Danny and Jamie. In season 8, it was revealed Erin wanted to join the police force like her family, wanted to take the exam but it wasn’t for her and chose law and became a prosecutor.[20]
