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This is the shocking moment a man was killed by a thug with just a single punch to the head following a row with a cyclist.

Andrew Young, 40, became embroiled in an argument with Victor Ibitoye after he blasted him for riding his bike on the pavement.

Just seconds after the altercation Mr Young was approached by Mr Ibitoye's friend, Lewis Gill, who launched a horrific attack on the Asperger's Syndrome sufferer.

Shocking CCTV footage shows Gill, aged 20, throw a punch at Mr Young that was so forceful he was flung off the pavement and onto the road, striking his head.

The callous thug is then seen walking away from the man as he lay lifeless on the ground.

He was rushed from the scene in Bournemouth, Dorset, to Southampton General Hospital in Hampshire where he died the next day.

A post mortem found no injuries to suggest that the vulnerable victim had tried to defend himself.

Gill pleaded guilty to one count of manslaughter at Salisbury Crown Court and was jailed for four years and six months.