A mother has spoken of her outrage after a man was given a four-and-a-half-year jail sentence for a punch that killed her son.
Andrew Young, 40, died after being struck in the unprovoked attack by Lewis Gill, 20, in Bournemouth, Dorset, on November 6 last year.
A chilling video of the assault was released by police.
“I saw the CCTV footage in court and you can see that Andrew didn’t cause Lewis Gill any harm," said Pamela Young, 71. "The sentence is an absolute joke."
"I’m a committed Christian but I think that if someone takes a life they should be prepared to forfeit their own.
“There have been many people who have committed manslaughter or murder in this country and they never even serve a full sentence.”
Images of the assault show Mr Young challenging a cyclist who was riding his bike on the pavement.
After one minute of discussion between the pair, Gill - an acquaintance of the cyclist - arrives at the scene.
The cyclist rides off and Gill appears to turn to follow him - but suddenly lunges towards Mr Young and launches a single vicious punch at his head.
Mr Young immediately falls on to the ground, where he lies motionless. Gill, of Sutton in south London, glances back at him then callously walks away.
Gill later pleaded guilty to manslaughter and was sentenced at Salisbury Crown Court to four-and-a-half years in prison.
Detective Inspector Marcus Hester, of Dorset Police's major crime team, said: "This was a violent attack on an innocent man which had a tragic outcome.
"This case shows that violence does not resolve anything and can have far-reaching consequences not imagined at the time.
"Today the court has issued a sentence deemed appropriate and in accordance with the evidence put to them.
"Criminal behaviour such as this will not be tolerated and we are committed to bringing offenders to justice."
The incident occurred on November 6 last year outside the Tesco Metro store on Charminster Road in Bournemouth.
Mr Young sustained a serious head injury and later died at Southampton Hospital.
Gill will serve a further six months imprisonment for other matters.