Captain Victoria Gates (Penny Johnson Jerald) (seasons 4–7) is Montgomery's replacement as captain of the 12th Precinct. At her own insistence, she is called "Sir" by the officers who report to her. Formerly with Internal Affairs, Gates, known to some as "Iron Gates", is more interested in career advancement and the reputation of the precinct, and by extension, the NYPD, than in the finer points of interpersonal dynamics, making decisions based on the political impact that they would have. This contrasts with the style of her predecessor, who made decisions based on how they would affect people (for Example, concealing a policewoman's vigilante activities because of the potential political backlash), and takes a dimmer view than her predecessor of the Beckett-Castle working relationship. Although she is obliged by the mayor to allow Castle to stay on in his consulting role, Gates tries to convince Beckett that she can be a better detective without him around. In the episode "Still", Gates reveals that she was aware that Castle and Beckett were in a relationship, but tells them that she did not say anything in order to maintain her own plausible deniability, and she promises to continue her silence on the condition that the two be professional on the job. In "Dial M for Mayor" she encourages Beckett to perform her duties objectively and dispassionately, stating her attitude in IA and Homicide was not because she hated police officers, she works hard to hold people accountable so NYPD officers like her father, uncle, and subordinates can bear the cost of serving the people of New York free of corruption. She has a sister, named Elizabeth Weston, who's a US Attorney. The two have a tense relationship as years before, Gates had to bust a corrupt cop involved in one of Elizabeth's investigations despite Elizabeth's protests. They reunite over another case and put aside some of that bad feeling.