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.

As investigations begin, it becomes clear there are no suspects and no obvious clues.

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.

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Presented by John Sweetman 

Created by Darren Cleary 

Episode Written by John Sweetman

Script Edited by Eoin Brennan 

Executive Produced by Eoin Brennan 

Executive Produced by Ruth Fitzsimons 

Produced by Siobhan Walsh and Siobhan Maguire 

Sound Design and Editing by Neil Kavanagh 

Audio Editing support by Ed Smith 

Marketing support by Bríd Walsh and Roisin Reilly 

Social support by Mark Hayes and Robyn Ree 

Artwork and graphics by Eric Rowntree

Video by Ger Walsh