MYSTERY surrounds the death of a 71-year-old retired cleaner who had never knowingly come into contact with asbestos, but died from a cancer usually caused by the deadly mineral. Pauline Verity, of Bradford Road, Keighley, worked at a butcher's making sausages, then at Bingley's Andertons Engineering, making fastening clips before spending more than 20 years at Morton Close Nursing Home in Crossflatts.