Blue Bloods: Season 6, Episode 13

6 - 13: Stomping Grounds

When a well-regarded, newly retired NYPD lieutenant is accused of shooting a group of potential muggers on the subway and then disappears, Frank must deal with the fallout. Also, when a drug dealer returns to Baez’s old neighborhood, she and Danny must figure out how to arrest him for a murder that Baez witnessed as a child.