Overview

• Standing trial at Bristol Crown Court, 92-year-old Ryland Headley has pleaded not guilty to the rape, murder of 75-year-old Louisa Dunne in June 1967.
• Andrew Parry described acid phosphatase screening followed by DNA profiling on preserved skirt swabs, hair samples to produce full genetic profiles.
• He testified that statistical analysis indicated a one-in-a-billion chance the DNA did not originate from Headley.
• Parry said tests on a scarf, facial swabs yielded inconclusive findings, highlighting limits of older evidence.
• Detective Jo Marks reviewed decades-old evidence in 2009, enabling preserved items from the original 1967 investigation to produce the 2023 forensic breakthrough.