Poisoning suspected in 5th hospital death STOCKPORT, England, Jan. 23 (UPI) -- A fifth person has died of suspected insulin poisoning at Stepping Hill Hospital in Stockport, England, police said. Linda McDonagh, 60, who died Jan. 14, was one of 21 patients who police suspect were poisoned at the hospital last summer, The Daily Telegraph reported Monday. McDonagh was "one of a number of patients who police believe suffered hypoglycemic episodes between June and July 2011 after being administered contaminated products at Stepping Hill Hospital," a Greater Manchester Police spokesman said. Last July, a major investigation began after saline drips at Stepping Hill were found to be deliberately contaminated with insulin. Previously this month, Victorino Chua, 46, a Stepping Hill nurse who is under investigation in the deaths of three patients, was released on bail. Another nurse, Rebecca Leighton, 27, was arrested and charged with six counts of endangering life last year, but the Crown Prosecution Service dropped the case against her because of a lack of evidence.