Law & Order: Criminal Intent (2001)

Season 4: Episode 16

When a young woman is shot at an appointment she never should have been at, Goren and Eames investigate her death and learn she had received a kidney transplant a few years earlier. Initially they believe that Vanessa Nikos may have been killed so that her organs could be harvested, but soon learn that her death was more closely connected with the organ she initially received from living donor Boyce Wainwright. When her shooter, also awaiting an organ transplant, is also found dead, the police realise they're on to something.