The death of Simonetta Vespucci, the muse of Sandro Botticelli, has long been shrouded in mystery. For centuries, historians have attributed her untimely demise at age 23 to tuberculosis, a common and often fatal disease during the Italian Renaissance. However, a recent study challenges this long-held assumption, offering a fascinating new perspective on the matter. In 2019, the author and their team proposed an intriguing alternative explanation, combining art history and clinical endocrinology. They examined the portraits attributed to Botticelli, noting subtle changes in Simonetta's facial features over time, which they attributed to a pituitary adenoma, a tumour of the small gland at the base of the brain. This tumour, they suspected, was secreting growth hormone and prolactin, leading to facial contour alterations and, in some cases, unexpected lactation. While this initial paper was cautious, the new study takes a bolder approach, suggesting that Simonetta's death itself was consistent with a specific medical emergency: pituitary tumour apoplexy. Apoplexy occurs when a pituitary tumour bleeds or rapidly swells, causing severe symptoms such as a sudden and intense headache, loss of vision, confusion, and a swift decline in hormonal regulation. This theory addresses a critical aspect that tuberculosis alone cannot explain: the rapid transition from apparent health to death in a young woman. The authors present three key strands of evidence to support their argument. Firstly, the physical changes in Simonetta's portraits, painted by Botticelli over several years, indicate a tumour growing over time. Secondly, the symptoms described in chronicles of her final illness align closely with the clinical presentation of apoplexy. Lastly, two documented events in the months before her death, including a collapse during dancing and a violent encounter, could have triggered a bleed or sudden tumour expansion. Despite the lack of direct evidence, such as tissue samples or scans, the authors argue that the combination of portraits and historical records provides a more comprehensive understanding of Simonetta's fate. This study encourages historians and medical professionals to re-examine cases like Simonetta's, highlighting the potential for medical knowledge to shed new light on historical mysteries. It also underscores the importance of interdisciplinary approaches, where art history and clinical endocrinology can collaborate to unravel the complexities of the past.