 A number of other patients are also believed by police to have been poisoned in this way, though most did not suffer fatal consequences.Two further deaths in the A1 and A3 wards were added to the investigation on 21 July.Three patients' deaths – two elderly males, George Keep, 84 and Arnold Lancaster, 71, and a female – Tracey Arden, 44 – were attributed to the alleged contamination, however it was also reported that each of the patients also had underlying medical conditions that made them weaker.