<Tr> <Td_colspan="8"> Danny's son Sean suffers a head injury while biking with Erin, Nicky, and Jack . He is taken to the hospital unconscious and the family is told it will take time for him to wake up . The timing couldn't be worse for Danny, as it happens while he is in the midst of investigating a sniper (Paul Anthony Stewart) who is shooting motorists that drive gas guzzlers . His ammunition consists of lead alternatives and he leaves trash from a green market at the crime scene . Danny and Kate track down the head of an environmental movement (Neal Huff), who points the finger at an ex-military sniper he believes committed the crime . Interspersed within the initial investigation, Danny visits Sean in the hospital and prays to his deceased brother Joe to intervene and help Sean recover . Danny leaves and he and Kate find the accused sniper dead from an apparent suicide . Danny notices the man appeared to have shot himself with his right hand, despite it being a recorded fact that he was left - handed . He was hence murdered and Danny comes to the conclusion that the environmental chief set them up . Realizing that his time is up, the environmental chief tries to flee from Danny on his bike, but is hit by an SUV (ironically, the same type of car that the sniper would have targeted) and incurs a broken leg, allowing him to be caught . Back at the hospital, Sean wakes up with Danny and Frank nearby . Danny then visits Joe's grave and says, "Thanks, kiddo ." </Td> </Tr> <Tr> <Th> 55 </Th> <Td> 11 </Td> <Td> "Front Page News" </Td> <Td> Robert Harmon </Td> <Td> Dawn DeNoon </Td> <Td> January 11, 2013 (2013 - 01 - 11) </Td> <Td> 311 </Td> <Td> 11.22 </Td> </Tr> <Tr> <Td_colspan="8"> Jamie must deal with the emotional consequences of his actions on the job, after he shoots and kills a man posing a potential threat to a park's neighborhood . The fatal shooting was the man's apparent attempt at suicide by cop, revealing that he was of unstable mind and hiding a secret from his past . In order to deal with the aftermath of the shooting, Jamie must attend a trauma debriefing by NYPD psychologist Dr. Grace Meherin (Annabella Sciorra). Danny investigates the suicide in order to help Jamie overcome his trauma . Meanwhile, Erin questions Mayor Poole on the witness stand regarding an embezzling case involving his campaign consultant . At the family dinner, Frank reveals that Erin would be able to know if the mayor was lying if he scratches his head, which Frank knows from winning a poker game with the mayor . The Mayor continuously avoids being questioned on the stand, alerting Erin to the fact that he may not wish to lie under oath . Following the conclusion of the trial with the mayor's employee pleading guilty to the charges, Erin questions Mayor Poole, asking him if he had lied about withholding evidence . To this he replied' no,' but after walking away scratches his head, revealing that he did lie to Erin . Later, Frank, Danny and Jamie sit around the kitchen table, contemplating the fact that they are all in the 10 percent of police officers who discharge their weapons and end up killing someone--a group Frank says,' that no one wishes to be in .' </Td> </Tr> <Tr> <Th> 56 </Th> <Td> 12 </Td> <Td> "Framed" </Td> <Td> David M. Barrett </Td> <Td> Daniel Truly </Td> <Td> January 18, 2013 (2013 - 01 - 18) </Td> <Td> 312 </Td> <Td> 11.64 </Td> </Tr>

Blue bloods season 3 episode 22 – the bitter end