<p>Gardaí are called to a house in north Dublin, where they make a grim discovery. 72-year-old Marie Dillon has been found murdered in a violent attack inside her home.</p><p></p><p>As investigations begin, it becomes clear there are no suspects and no obvious clues. </p><p></p><p>In this episode of Lines of Enquiry, John Sweetman revisits the case that brought him face to face with his first murder scene at just 26 years of age, in his early days training to become a forensic fingerprint expert. </p><p></p><p>Presented by John Sweetman </p><p></p><p>Created by Darren Cleary </p><p>Episode Written by John Sweetman</p><p>Script Edited by Eoin Brennan </p><p>Executive Produced by Eoin Brennan </p><p>Executive Produced by Ruth Fitzsimons </p><p>Produced by Siobhan Walsh and Siobhan Maguire </p><p>Sound Design and Editing by Neil Kavanagh </p><p>Audio Editing support by Ed Smith </p><p>Marketing support by Bríd Walsh and Roisin Reilly </p><p>Social support by Mark Hayes and Robyn Ree </p><p>Artwork and graphics by Eric Rowntree</p><p>Video by Ger Walsh</p>