BEST QUALITY AVAILABLE File photo dated 16/1/2016 of Police outside a house on Sunny Bank Road in Helmshore, Lancashire as a murder investigation has been launched after Sadie Hartley was found dead. Sarah Williams is appearing at Preston Crown Court accused of the murder of the mother of two. PRESS ASSOCIATION Photo. Issue date: Tuesday July 5, 2016. Hartley, 60, in the head with a stun gun on the doorstep of her home in the village of Helmshore, Lancashire and then stabbed and slashed with a knife. See PA story COURTS Hartley. Photo credit should read: Pat Hurst/PA Wire NOTE TO EDITORS: This handout photo may only be used in for editorial reporting purposes for the contemporaneous illustration of events, things or the people in the image or facts mentioned in the caption. Reuse of the picture may require further permission from the copyright holder.