Sonny Vetter is the paternal uncle of Det. Tracy Vetter, Nick Knight's partner in Season Three of Forever Knight. He has a severe heart condition requiring a transplant. In Let No Man Tear Asunder, a homicide case involving the black market in stolen organs leads Tracy to go undercover, using her Uncle Sonny's case as a way to persuade the organization that she is genuinely interested in purchasing an illegal heart for her uncle. To bolster her case, she looks up her uncle's medical records in order to remove him from the "Urgent" list so that the doctor running the organization will believe that she is bypassing the proper channels.