It now seems that, like many an underworld victim before him, he made the mistake of getting into a vehicle with people who did not wish him well.
It was raining heavily, and Wynter was anxious not to get his expensive suit wet.
He was summoned to Islington, where a van was waiting.
He borrowed an umbrella and was still protecting himself from the rain as he got into the van backwards, not seeing the men who were to kill him until it was too late.
Prosecution witnesses preferred to go to jail for contempt rather than give evidence against Wynter.
But Mitchell, who was very strong but slightly simple, became a liability.