Things take a dangerous turn at the courthouse when Erin is taken hostage on Blue Bloods. "To Protect and Serve" is the third episode of the show's fourth season.
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Danny must keep it quiet when a movie star is shadowing him on the job on Blue Bloods. "The City That Never Sleeps" is the second episode of the show's fourth season.
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Blue Bloods has Marisa Ramirez as a full-time cast member. This is a photo from Season 4.
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Erin and Danny argue when she must release a suspect due to lack of evidence on the season premiere of Blue Bloods. "Unwritten Rules" is the first episode of the show's fourth season.
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Marisa Ramirez is now a series regular on Blue Bloods. She is Danny's permanent partner.
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The Reagans watch as another crisis takes place on the season finale of Blue Bloods. "This Way Out" is the 23rd episode of the show's third season.
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Vinny and Jamie are called to the scene when a young mother threatens to jump with her infant on Blue Bloods. "The Bitter End" is the 22nd episode of the show's third season.
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Danny questions a man covered in his girlfriend's blood on Blue Bloods. "Devil's Breath" is the 21st episode of the show's third season.
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Blue Bloods Quotes

Frank: Down these mean streets a man must go who is not himself mean. Who is neither tarnished or afraid.
Henry: Raymond Chandler?
Frank: His definition of a hero.

Targets don't shoot back.

Frank