Lucy Letby: Inside the Mind of Serial Killer Nurse
Written by: Therapy Near Me Editorial Team Clinically reviewed by: qualified members of the Therapy Near Me clinical team Last updated: 19/06/2025 This article is intended as general information only and does not replace personalised medical or mental health advice. Learn more about our Editorial Policy. Lucy Letby, a former neonatal nurse, was convicted of murdering seven infants and attempting to murder six others between 2015 and 2016. Her case has shocked the public, not just for the brutality of her actions, but for the contradictions in her character—someone seemingly compassionate working in a caregiving profession, who secretly caused immense harm. Understanding the psychology behind Letby’s actions raises important questions about motive, personality, and the psychological traits that allowed her to engage in such heinous crimes. Motive and Psychological Profile The precise motives behind Letby’s actions remain speculative, but several psychological theories and behaviours emerged during her trial that can offer insights. One theory presented was that Letby acted out of a desire for attention and control. Some psychologists suggest that her repeated searches for the families of her victims on social media and her efforts to maintain contact with them after their infants’ deaths may indicate a need for validation and power over the emotional lives of others (Independent, 2023). She was described as “playing God,” seemingly deriving satisfaction from controlling life and death in her work environment. Moreover, prosecutors suggested that Letby may have been motivated by an infatuation with a doctor in her unit, seeking his sympathy and attention by causing these tragic events. This type of “hero complex,” where an individual harms others to create a situation where they are needed or can gain recognition, has been observed in other healthcare-related serial killers. The Hospital’s Initial Response The hospital’s initial response to the concerns surrounding Lucy Letby’s behaviour was characterised by delays, inaction, and reluctance to escalate the issue. Several key actions (or lack thereof) are now viewed as contributing to the length of time Letby was able to continue harming infants without detection. 1. Dismissing Early Warnings The first signs of something unusual came in 2015, when a group of senior doctors noticed a spike in neonatal deaths and collapses at the Countess of Chester Hospital. Consultant Dr. Stephen Brearey and other colleagues raised concerns about Letby after noticing that she was present for each of these incidents. However, when the doctors reported their suspicions to hospital management, their concerns were dismissed as coincidence. The hospital’s leadership at the time was hesitant to act, possibly out of fear of reputational damage or legal implications (BBC News, 2023). Despite the increasing number of incidents, management viewed the deaths as medical anomalies and blamed issues such as staffing shortages and technical failures in the neonatal unit, rather than launching an in-depth investigation into Letby’s role (The Guardian, 2023). 2. Reassignment Instead of Investigation In 2016, as the incidents continued to occur, hospital leadership finally reassigned Letby from her direct duties in the neonatal unit to an administrative role. However, this action was framed as an effort to protect her from stress and the demands of the unit, not as an acknowledgment of her potential involvement in the deaths. Despite the reassignment, she remained part of the hospital’s staff and retained access to sensitive areas (The Independent, 2023). This internal decision delayed any meaningful investigation and allowed Letby to remain employed, despite serious concerns from her colleagues. 3. Refusal to Involve Police One of the most critical failures in the hospital’s initial response was its refusal to contact the police, even after multiple requests from senior medical staff. By 2016, several doctors, including Dr. Brearey, urged hospital executives to escalate the investigation to law enforcement. Despite these repeated requests, hospital management opted for internal reviews, citing insufficient evidence and suggesting that the deaths were due to systemic issues rather than intentional harm (BBC News, 2023). It wasn’t until 2017, when the concerns became too great to ignore, that the hospital involved the police. This delay allowed Letby to continue working for an extended period while avoiding formal scrutiny. 4. Apology to Letby A particularly controversial moment in the hospital’s response was their decision to apologise to Letby. After she was removed from her clinical duties, Letby filed a formal grievance against the hospital, claiming that the doctors who raised concerns were unjustly targeting her. The hospital’s leadership upheld her grievance, ordering the consultants to apologise to her. This decision is seen as a key moment when the hospital failed to act appropriately and protect patients from further harm (The Guardian, 2023). The Role of Personality Traits Letby displayed traits often associated with the “Dark Triad” of personality traits: Machiavellianism, narcissism, and psychopathy. These traits can combine to form a dangerous psychological profile that enables individuals to manipulate and harm others without remorse (Paulhus & Williams, 2002). Psychopathy is characterised by a lack of empathy and emotional detachment, both of which could explain her ability to carry out such acts while maintaining a seemingly normal external facade. Meanwhile, her narcissistic tendencies might explain her desire for attention and recognition, whether from colleagues or her infatuation with the doctor. Psychologically, healthcare killers like Letby often display a sense of entitlement and superiority over life-and-death situations. Her case shares parallels with other medical serial killers, such as Harold Shipman and Beverley Allitt, both of whom killed under the guise of providing care (Wilson, 2023). Their ability to operate for extended periods without detection often results from trust placed in healthcare workers and a lack of early investigation The Need for Power and Control Another potential explanation for Letby’s actions is her desire to feel in control. In cases of healthcare-related serial killings, the perpetrators often feel a sense of empowerment by deciding who lives or dies, viewing themselves as possessing a god-like ability to manipulate outcomes (Vaughn & DeLisi, 2018). During her trial, it was revealed that Letby was “bored” with less critical cases and would seek out opportunities to
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