 Juliet O'Hara first appears undercover in the show's second episode, "Spellingg Bee", as a recently transferred junior detective from Miami Beach where she attended the University of Miami, replacing Lucinda Barry as Head Detective Carlton Lassiter's partner after Shawn discovered Carlton and Lucinda were having an affair during the first episode, "Pilot".Born in 1981, she was raised in a family of brothers and is shown to be close with both her parents and her siblings.Although she is initially frustrated by her coworkers not taking her seriously enough due to her relatively young age, as the series progresses she is given more responsibility, being left in charge in the absence of Lassiter and then Interim Chief Karen Vick.