UPDATE: Dominic Grieve, the Attorney General, is considering whether to refer the four-and-a-half year jail term to the Court of Appeal for being unduly lenient.
The mother of a man who was killed with a single punch has described his attacker's four-year sentence as "an absolute joke".
Andrew Young died in hospital after the unprovoked attack by Lewis Gill in Bournemouth in 2013.
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Mr Young, 40, had confronted Gill's friend, Victor Ibitoye, for cycling on the pavement, telling him it was a dangerous thing to do.
What happened next was recorded in shocking CCTV footage.
Gill, a convicted robber who was already facing criminal charges, punched Young, who fell to the ground, suffering fatal head injuries.
Police described it as a "violent attack on an innocent man", while a friend of Mr Young told the Mirror he had been "gentle and wouldn't hurt a fly".
Gill, 20, of Ridge Road, Sutton, south London, admitted manslaughter at Salisbury Crown Court and was jailed for four years.
Det Insp Marcus Hester, of Dorset Police, said: "This case shows that violence does not resolve anything and can have far-reaching consequences not imagined at the time."
Had Gill been found guilty of murder, he would have been facing a life sentence.
The victim's mother, Pamela Young, 71, told the Mail: “I saw the CCTV footage in court and you can see that Andrew didn’t cause Lewis Gill any harm. The sentence is an absolute joke."