 As Debra fell in love with him, he used Debra as a means to get closer to Dexter.The week before Dexter was informed of the death of his biological father (Joseph Driscoll) and met Brian Moser for the first time, Brian disguised himself as a cable repair man and visited the house of the deceased man.At the end of the ninth episode of the first season, it was implied that Brian had murdered Joseph Driscoll while in disguise by injecting insulin.