growth occurs in the tumour she will stop practising with immediate effect, Tara later begins to notice signs of growth but keeps it a secret. Hanssen organises CT scans to which she refuses to go to but later her boyfriend Oliver Valentine (James Anderson) finds a recent CT she had and informs Hanssen who tries to pull her out of theatre. Later he shows her the scan which confirms a 20% growth and with the support of Hanssen, Tara agrees to surgery to remove a large amount of the tumour but following complications in theatre she is pronounced brain-stem dead leaving Hanssen deeply upset. Hanssen mellows as he returns to the more hands on side of medicine, spending more time treating patients on the wards and developing his working relationships with colleagues. Hanssen departs Holby General quietly after turning over the role of CEO to Serena. Hanssen returns to Sweden where he reconciles with Maja Johansson (Pia Halvorsen), his former partner, and finally meets his son, Fredrik, and his newborn grandson. Over twenty months later, Hanssen's successor Guy Self (John Michie) steps down from the position and orchestrates a plan to bring in a new CEO who will persuade the board to fund his vision of a new neurology centre. Realising that Guy is manipulating both her and the board for his own ends, Serena takes action and makes a call to Hanssen who ultimately decides to return to Holby and takes the vacant CEO position. A rivalry develops between Hanssen and Guy, while he also shows his disdain towards Dominic Copeland (David Ames). Hanssen agrees to dress up as Santa so the children at the hospital are not let down after the hired Santa does not show up. Hanssen's son Fredrik arrives at the hospital and clashes with his father. After weeks of arguing, Fredrik leaves but later returns with a gun, killing Raf di Lucca and severely wounding Oliver Valentine and Jac Naylor. Hanssen, along with the police, confronts Fredrik, who is then shot and dies. After Raf's memorial, Hanssen's mental health deteriorates and he takes a break from the hospital, calling on Serena who returns to Holby and takes charge in his absence. Roxanna MacMillan tells Hanssen that he should not be torturing himself, but he still takes responsibility for Fredrik's actions. Weeks later, Hanssen returns to the hospital and resumes his role as CEO. He visits