as such the two share an unspoken hostility during the fifth series. She is seen to be having a committed relationship with a woman, and doesn't drink alcohol. Sean McCartney PC Sean McCartney (Sean Maguire) first appears in Series 2 as an old flame of Rachel's. Over the course of an investigation they reconnect and become an item (to the chagrin of Kevin). Sean is any easygoing guy who never seems to get worked up about anything; though his persistent attempts to woo Rachel irritate her, he is supportive and always there to help when she needs it. Eventually he proposes marriage, going so far as to set a date and make the arrangements without telling her first. A reluctant Rachel agrees to the engagement in the Series 2 finale, after Sean turns up evidence exonerating her in a murder inquiry. Their wedding is shown in flashbacks in the second episode of Series 3. Rachel soon realizes the marriage was a mistake, as she never really wanted it, and after a one-night-stand with a stranger she has sex with Kevin Lumb (their best man). In the penultimate episode of Series 3 Rachel admits the affair to Sean, who attacks Kevin in the middle of the office, humiliating all three of them, before getting a divorce. Will Pemberton DSI Will Pemberton (Steve Toussaint) appears in Series 4 as the head of the Vice team. He enters into a relationship with Rachel, and secures her a Vice secondment in London. The two later separate. Recurring cast and characters Overview Alison Bailey Alison Bailey (Sally Lindsay) is Rachel's older sister and is married with children. When their mother walked out, Alison essentially became the mother of the Bailey household, which she feels cost her the chance to do something with her life. As a result, she harbours a deep resentment towards their mother. Alison's relationship with Rachel and Dominic is strained at times because of her maternal instincts and occasional self-righteous behaviour but she tries very hard to support them. Sally Lindsay, who alongside Suranne Jones created the original idea for Scott & Bailey, has appeared in every series. Dave Murray DCS (Detective Chief Superintendent) Dave Murray (Vincent Regan), Gill's ex-husband, is well-known for his philandering ways and irresponsible attitude toward his work. He is father of her son, Sammy (Jake Roach) but left Gill when he got a 23-year-old uniform officer pregnant.