The 21-year-old nursing home assistant suspected of killing an elderly patient with insulin may have committed two more murders. The man has worked at several nursing homes in the region and was arrested two weeks ago. The public prosecutor says he is now suspected of killing two more elderly patients. Four other suspicious deaths are under investigation as are six cases in which the patient survived. The investigation began earlier this month after a woman at a nursing home became unexpectedly unwell. She was taken to hospital, where medical staff said they suspected she had been given a dose of insulin. Nursing home officials then called in the police. The man was remanded in custody for 90 days while the investigation continues.