<P> 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 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 Joseph's attack and blackmails him to make his mother support her application for a consultant post, which backfires when she is instead granted sick leave . </P> <P> 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, aided by a crutch for several months afterwards . Joseph and Faye become engaged, but their relationship deteriorates . An intoxicated Joseph ends up in bed with Jac, and she manipulates him into believing that she is expecting 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 for one another, but Joseph states that he has moved on with Faye, leaving Jac distraught . </P> <P> Jac shares a kiss with foundation doctor Oliver Valentine (James Anderson), but their relationship doesn't go any 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 . </P> <P> Faye becomes pregnant with Joseph's child but has a breakdown and refuses to leave the psychiatric unit she has admitted herself to when she goes into labour . Jac convinces her to receive proper medical care, saving Joseph's son . Grateful for her intervention, Joseph shares a kiss with Jac and they resume their relationship . Jac intercedes upon discovering that Faye is planning to leave the country with the baby, named Harry and takes them 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". </P>

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