Javier Esposito (Jon Huertas)Javier Esposito is a New York City Homicide Detective who works in the 12th precinct with Kate Beckett.Before joining the force Esposito served in the Army Special Forces and was an officer in the Organized Crime Task Force at the 54th precinct.Esposito and his partner Detective Kevin Ryan work with Beckett and best-selling mystery novelist Richard Castle to solve murder cases.Esposito is a good and serious cop who is very close to his partner and dedicated to justice. But he also has a sardonic sense of humor and often has a quip at the ready. He can be stoic and strong on the job and lighthearted and sweet in the office.Esposito is a skilled marksman and believes that he is a ladies man.