Sheppard first appeared in Season 7. She was Miss Anne Arundel County (beauty pageant queen) sometime prior to joining the Baltimore Police Department. She came into the Homicide Section from the Escape and Apprehension Section (Fugitive Squad) and was partnered with Meldrick Lewis. A number of the male detectives are attracted to her, and she is asked out by Meldrick Lewis and Tim Bayliss – she turns them both down in a non-confrontational manner, developing a strong friendship with Bayliss and an initially strong working relationship (see below) with Lewis.
Her career is tested when an arrest goes bad; Sheppard is severely beaten by the suspect, and her gun is stolen, causing the department to doubt her ability to do her job.[2] Although he at first comes to Sheppard's defense, Lewis also doubts that he can trust her, leading to tension between the two and often resulting in their seeking other partners. After spending her recovery time behind a desk, Sheppard is allowed to be the primary detective on the "Internet Killer" case, and redeems herself somewhat by leading the investigation that led to the killer, Luke Ryland, being arrested.[3] However, Sheppard later learns that Lewis was not the only cop in the Homicide unit who had concerns about her job performance: Terri Stivers outright says that Sheppard went for her gun too early during the confrontation. In the series' penultimate episode, Sheppard and Laura Ballard work a case involving a murdered female gang member, and Sheppard feels pressured not to call in one of the male detectives to help them. When they close the case, Sheppard says that she can do her job, no matter what anyone thinks.[4]
In the series finale, Lewis makes a gratuitous reference to her losing her gun, and Sheppard just scoffs and walks away while Bayliss calls Lewis an ass and they have an argument over trusting their partners. While Lewis partners with Falsone to solve the murder of a woman and is shocked when the woman's sister, a devout nun, offers solace and comfort to the killer when he's arrested by them, Lewis reconsiders his actions. Falsone responds bluntly to Lewis' sincere question of forgiveness by saying "you should ask Sheppard." Lewis then asks Sheppard to join him on a homicide call, which they work without any problems.[5]
