Blue Bloods (2010)

S8E4 Out of the Blue

Danny and Baez delve into the murder of a detective who was shot just before he was set to testify against a notorious felon. Meanwhile, Frank takes matters into his own hands when Garrett faces an assault from a S.W.A.T. team at his residence. In a twist, Erin decides to involve a confidential informant, despite Anthony's objections.