A south London man, who in an unprovoked attack delivered a fatal blow to a pedestrian with Asperger syndrome in southern England, has been handed a four-and-a-half year prison sentence, a conviction the victim's mother called an "absolute joke".

Shocking newly released CCTV footage shows the conversation that ended the life of Andrew Young on a busy street in Bournemouth.

The 40-year-old got into an argument after challenging a cyclist riding on the pavement.

Just as it seems like the argument has come to an end, one of the cyclist's friends, 20-year-old Lewis Gill sucker-punched Young and with a single powerful knocked him to the ground, leaving him lying motionlessly on the pavement.

Young was rushed to a nearby hospital, but died the following day.

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