It was a case of mistaken identity with tragic consequences.
Two friends, Max Dixon and Mason Rist went out to buy pizza in Bristol in January.
They were attacked by a group of teenagers carrying knives – who wrongly thought the pair were part of a group of youths who had thrown bricks at one of their houses.
The deadly knife attack was captured on a CCTV camera and took just 33 seconds.
Today, the four teenage killers were given life sentences.
And a warning, this report contains distressing details.