Police believe someone broke into their home that night and a fire was started, but no-one has ever been charged.
With claims of evidence compromised, mistakes made and missed opportunities. We turn our attention to the crime scene forensics.
Hear from people closest to the case, speaking for the first time about their concerns.
Written and produced by Gabby Colenso Presenter: Sonia Watson Sound Design: John Cameron-McIntosh Story Consultants: Barney Rowntree and Ben Robinson Online Producer: Rachael Smith Series Editor: Shahid Hussain Commissioning Editor: Alistair Miskin
A BBC Essex production for BBC Sounds.