A TV documentary that follows the work of a police force will show how the investigation into the actions of a teenage killer unfolded.
Nicholas Prosper used a shotgun to kill his mother Juliana Falcon, 48, his brother Kyle, 16, and his 13-year-old sister, Giselle, at their home in Luton on 13 September 2024.
The 19-year-old, who was arrested in the hours after the murders, was jailed for 49 years in March. A trial heard he intended to carry out a shooting at his former primary school.
The Channel Four series 24 Hours in Police Custody, which follows the work of investigators at Bedfordshire Police, will feature the case over two nights on 5 and 6 October.