Katy’s murder emerges not as a complete, settled account but as a confession assembled under pressure and revisited through evidence found too late to change the case. Damien Donnelly admits striking Katy Devlin with a rock, while the subsequent questioning reveals that his first account left out crucial information. A diary entry written by Katy before her death then restores a small part of her life beyond the crime, without providing proof sufficient to establish another person’s involvement.

The confession

During questioning, Cassie Maddox uses her profile of the killer to argue that the person responsible was not necessarily violent by nature, but may have acted because he believed he had no choice. Rob Ryan backs her account, then presses Damien with the prospect of what might follow if the killer continued to conceal the truth: fear, psychological collapse, or suicide. Cassie counters that confessing and serving a sentence could allow the offender eventually to live without the constant fear of discovery. The appeal makes the interview’s strategy explicit: the detectives present confession not only as an admission of responsibility, but as a way out of a life organized around concealment.

Damien is visibly tense throughout the exchange. He crushes an empty can in his hand before, after a long pause, giving a small nod in response to Rob’s question about whether the detectives’ description feels familiar. That reaction leads into his account of Katy’s visit. He says he had expected her at one o’clock, but she arrived around a quarter to one. She brought chocolate biscuits, gave him one, and spoke briefly about a ballet school. Damien says he directed her to look at a shelf, then struck her on the back of the head with a rock. The admission supplies the central act of the murder, but the account is fragmentary and does not answer every question the detectives raise.

What the first account leaves out

Later, Rob confronts Damien with the post-mortem findings and the discovery of a trowel in the tools shed. He accuses Damien of failing to disclose that the tool had been used to sexually abuse Katy after he killed her. Damien denies or resists the accusation, and Rob insists that such conduct could not simply have happened without a reason. The exchange does not produce an explanation: Damien begins to cry, and the interviewers spend a long time waiting and trying, without success, to draw out a motive.

The contrast between Damien’s initial admission and the later confrontation matters to how the confession can be read. The detectives have evidence they believe contradicts his omissions, but their questions are also forceful and, at points, supply details and interpretations for him to answer. His distress and his earlier nod are not a substitute for a complete account. The scene establishes that he struck Katy and that investigators regarded his first version as incomplete; it leaves the motive and the full extent of what happened without a clear answer in this interview.

Katy’s diary and the limits of later evidence

A year after Katy’s death, Rob reads entries from her diary. One describes her discovering that the diary had been moved from beneath her bed to a shoebox in Rosalind Devlin’s wardrobe. Afraid Rosalind would be angry if she took it back, Katy instead decides to keep it at Simone Cameron’s home, where she can write while practicing alone. The passage records a private act of caution and a decision to preserve a space of her own.

The final entry is dated three days before Katy died. Katy writes that Rosalind has apologized for being hostile about her going away, explaining that she had been worried about Jessica Devlin and would miss Katy too. Rosalind plans to give her a lucky charm for her dancing. Another diary passage mentions Rosalind making Katy drink something, but Rob recognizes that the detail could have been explained as an ordinary drink and that the charm proves nothing. The diary deepens the reader’s view of Katy’s relationships and final days; it does not, by itself, directly connect Rosalind to a crime.

Aftermath and narrative significance

Rob sends the diary and a small paper pouch to Sam O’Neill at Dublin Castle, where they are stored with the case materials. The investigation is closed, and Rob sees no basis for reopening it unless Rosalind commits a similar crime. Simone asks whether finding the diary earlier would have made a difference. Rob says probably not, while admitting to himself that he does not know whether that is true. The possibility that earlier discovery might have mattered remains unanswered.

The diary’s late arrival shifts attention from the investigative image of Katy as a victim to the ordinary, specific person who wrote about dancing, practice, a missing notebook, and a hoped-for lucky charm. Yet that recovery is incomplete: Rob reflects that the case had occupied more of his attention than Katy herself, and that the murder had eclipsed the rest of her life. The event’s aftermath therefore turns on two limits at once: Damien’s account does not resolve every aspect of the crime, and the surviving evidence cannot restore the future Katy expected or settle every suspicion around her death.