 In July 1979, Sutcliffe was interviewed by two Detective Constables who became suspicious.One of the officers, Detective Constable Andrew Laptew, in his report wrote that there was good evidence he was the killer, but the document was downgraded because of Sutcliffe's Yorkshire accent and the lack of a match with the hoaxer's handwriting.A then unknown victim of Sutcliffe at the time of Humble's first letter was Yvonne Pearson, whose body was undiscovered under a Bradford sofa at the time.