Tests on fifth patient to die of suspected poisoning at Stepping Hill Hospital A spokesman for Greater Manchester Police said of Mrs McDonagh: "She was one of a number of patients we believe suffered hypoglycaemic episodes between June and July 2011 after being administered contaminated products at Stepping Hill Hospital." The coroner for South Manchester, John Pollard, has been informed and detectives confirmed that "further tests are ongoing." It is understood that Mrs McDonagh, of Offerton, Stockport, had serious underlying health problems. Relatives have declined to comment on her death. Earlier this month police arrested a 46-year-old male nurse on suspicion of murdering three patients at Stepping Hill. Victorino Chua has been released on police bail until April pending further inquiries. Detectives initially held him on suspicion of tampering with medical records. They later re-arrested him on suspicion of three counts of murder and 18 of causing grievous bodily harm. Last summer another nurse at the hospital, Rebecca Leighton, 28, spent six weeks in prison after being arrested on suspicion of murder. She was later set free when the Crown Prosecution Service decided there was insufficient evidence to pursue the case against her. Both she and Mr Chua are currently prevented from working at the hospital. A team of detectives is still engaged in a massive and intensely detailed investigation at the hospital. Despite the months officers have spent on the mystery, they have yet to establish the degree to which the deliberate contamination of products could have contributed to the deaths of individual patients. So far around 650 people have been interviewed about the contamination, which came to police attention when nursing staff raised the alarm. A hospital spokesman said: "We are aware of the 60-year-old woman's death.