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Dexter structures his killing around "The Code of Harry", a body of ethics and procedures devised by his adoptive father Harry (who was a Miami cop) to make sure Dexter never gets caught and ensure that Dexter kills only other killers. Harry also trained Dexter in how to interact convincingly with other people despite being a psychopath, since the murder of his biological mother, Laura Moser, did in fact turn Dexter into a serial killer. As an adult, Dexter has largely escaped suspicion (with some exceptions) by being genial and generous and maintaining generally superficial relationships. However, his attachment to his sister Deb, his significant other Rita, his stepchildren and (later) his biological son have all complicated his double life and made him question his need to kill.