Siobhan Kelly was a Deputy for the Banshee County Sheriff's Department in Banshee, Pennsylvania, USA. She served under Sheriff Lucas Hood and worked with fellow Deputy Brock Lotus and Billy Raven. She had a romantic relationship with Sheriff Hood. She was married before to a man who physically abused her, and against whom she had a restraining order. She was murdered by Chayton Littlestone in the show's third season.
Siobhan was a tough, confident and independent woman who was good at being a cop. She lived alone in her parents´ old house but when rowdy bikers burned it to the ground as revenge for killing one of them, she moved into a trailer. She became infatuated with Lucas Hood and revealed her softer side despite Lucas´ intimacy issues. Even after she learned the truth about Hood, though initially understandably angry, Siobhan continued to care for him and was horrified to learn what he had been through. She wished to continue their romance elsewhere once learning everything about Hood, but has her life tragically cut short before she could. However, Siobhan would be avenged by her lover, who mercilessly hunted and killed her murderer.
Siobhan is not a cop yet in this episode, and Emmett Yawners is seen taken her out of The Forge from her abusive husband Connors, and tells her she can and should do better. In response she tries to kiss him, but he stops her, telling her that isn't really what she wants, and he doesn't require that.
Emmett says that he will have a "persuasive" chat with Connors. Siobhan mentions it must be nice being a cop and having the strength to protect yourself. Emmet suggests she would pursue this path herself, and she says she might consider that. (And since we see her as a cop in the actual show, we may deduce that she decided to pursue this path eventually).