Storylines
Jac arrives at Holby City Hospital as part of a team performing a hemicorporectomy. She is initially unsuccessful in securing a permanent position as a registrar, but returns to the hospital in this capacity several weeks later. Jac develops a rivalry with her fellow registrar Diane Lloyd (Patricia Potter), which intensifies when they both apply for the same consultant post. Neither are successful, but Jac is disappointed when Diane is later promoted above her, to locum consultant.
Unable to cope with the pressure of his job, cardiothoracic surgical registrar Joseph Byrne (Luke Roberts) accidentally overdoses, and is saved by Jac. She becomes romantically involved with him, hoping to ingratiate herself with his influential father, Lord Charles Byrne (Ronald Pickup). Taking this further, Jac later lies to Lord Byrne, claiming that she and Joseph have separated, resulting in Jac sleeping with Lord Byrne. She attempts to blackmail him into securing her a consultancy. Lord Byrne falls in love with Jac, and confesses their affair to Joseph, who pleads with her to dump him and offers her the chance to resume their relationship. Jac declines, choosing to be with his father. Diane commits suicide, and Lord Byrne attempts to use his influence to secure her position for Jac, but has a stroke before succeeding. After a failed attempt at making amends with Joseph, he has a heart attack and dies. Jac refuses to show remorse for destroying Joseph's family, resulting in him hitting her. She uses the resultant bruising to garner sympathy and secure a position on a stent trial, She is attacked by patient Alan Clooney during the stent trial (James Weber Brown), who unsuccessfully attempts to rape her. Jac declines to report it, but assaults him when he returns to the hospital six months later. At the start of series 10, she claims to be suffering from residual headaches from Josephs attack. She blackmails Joseph into making his mother support her application for a consultant post, which backfires when she is instead granted sick leave.
When Clooney is later found stabbed through the heart, Jac is arrested for attempted murder. She is cleared when a young victim of his confesses to the attack. Suspicious of ward sister Faye Morton (Patsy Kensit), with whom Joseph has begun a relationship, Jac follows her to a secret assignation, accidentally crashing her motorbike en-route. She spends some time in intensive care, and has to walk with the aid of a crutch for several months afterwards. Joseph and Faye become engaged, but their relationship deteriorates. An intoxicated Joseph has sex with Jac, and she manipulates him into believing that she is carrying his baby. Her lie is uncovered when she is treated as a patient, having been knocked down the hospital stairs. Soon thereafter, she and Joseph are trapped in an operating theatre together, when it is discovered that their patient had been transporting contaminated waste. They declare their love, but Joseph states that he has moved on with Faye, leaving Jac distraught.
Jac shares a kiss with foundation doctor Oliver Valentine (James Anderson), though their relationship goes no further. When her estranged mother, Paula Burrows (Julie Legrand), is admitted with kidney damage, Jac reveals that she was abandoned aged twelve and placed in foster care. She agrees to a kidney transplant to save her mother, who deserts her again following the operation. Jac discovers that she has a younger half-sister, but detaches herself from her family for good. Having transferred back to general surgery, Jac develops a reluctant friendship with locum registrar Sacha Levy (Bob Barrett), who successfully recommends her for a locum consultant position. Afraid of being demoted after making a clinical error, Jac blames the mistake on ward sister Chrissie Williams (Tina Hobley), the mother of Sacha's son, which leads to the termination of their friendship.
Faye becomes pregnant with Joseph's child, but has a breakdown and refuses to leave the psychiatric unit she has been admitted to when she goes into labour. Jac convinces her to receive proper medical care, saving Joseph's son. Grateful for her intervention, Joseph kisses her and they resume their relationship. Jac intercedes upon discovering that Faye is planning to leave the country with the baby, named Harry. She brings her back to the hospital, where Joseph convinces her to leave Harry with him. He decides to move to the countryside and become a general practitioner, so he will have more time to spend with Harry. Jac declines to accompany him, valuing her career over a quiet family life, but is devastated by Joseph's departure. She briefly resigns when her locum consultancy is rescinded, but upon failing to find work elsewhere as a result of her reputation, returns once more as a cardiothoracic registrar. She begins a rivalry for a cardiothoracic consultant position with new registrar Sahira Shah (Laila Rouass). A position that she later wins, Jac receives a box containing fancy stilettos and a bottle of champagne from Connie Beauchamp, with a note about the shoes saying "Fill them! x".
Jac helps Sahira set up a Cardiac Trauma Unit as a way of saving cardiothoracics when Darwin ward is threatened with a merger with St. James' in. In the wake of the plastics scandal, Jac and Sahira continue to use CTU until Hanssen dismantles the project following Sahira's departure. In Jac helps Sacha rekindle his love for Chrissie by giving him a lift to the airport. When Jac berates new F1 Tara Lo in Hanssen refers her onto a people skill's course and she is forced to publicly apologise to Tara. On the people skill's course, Jac meets future transplant nurse Jonny Maconie who is pretending to be a neurosurgeon from St. James. Despite their different work attitudes Jac and Jonny end up in bed together however Jac tells Jonny afterwards that this, "never happened." Jac is shocked when Jonny turns up at Holby working as a nurse however they continue their relationship. Jac is offered a six-week research post in America. In Jac assists Mo Effanga when she gives birth. Jac continues to be a brutal mentor towards Tara but is taken aback when she discovers Tara's condition. With her relationship with Jonny intensifying, Jac worries that the hospital is gossiping about her private life and takes out her issues on Mo. Towards the end of Series 14, Jac worries that she might be pregnant with Jonny's baby but following pressure from Jonny to take a pregnancy test it is assumed that the result is negative. Jac is invited to Sacha's stag do and makes no secret of her opinion of Sacha's bride to be, Chrissie.
Following the negative publicity bombarding Holby in the wake of Hanssen's press release, Jac becomes concerned that he is not the leader she once thought he was and makes her concerns known to Terrence Cunningham. In Jonny is stuck between a warring Jac and Mo and with her professional detachment called into doubt by a patient, Jac decides to take a drastic step in her relationship with Jonny. Jac is annoyed to discover that Jonny is coping well with their breakup and in an effort to rile him she goes out with a new man. In Jac begins to rekindle her relationship with Jonny but their drink is called off when new acting CEO, Imelda Cousins lets slip that it was Jac who voiced her concerns about Hanssen to Cunningham.
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