A 22-year-old man has been sentenced to a minimum of two years in jail for killing a pensioner who challenged him about urinating in the street.
Benjamin Kerr died in hospital days after the attack
Stephen Chapman of Morley Close, Melton, attacked Benjamin Kerr, 78, outside a supermarket in his home town in Leicestershire on 10 June 2006.
The 78-year-old man, who suffered from Alzheimer's disease, died in hospital 13 days later.
Chapman earlier admitted manslaughter at Leicester Crown Court.
The court heard that the great grandfather had taken exception to seeing two men urinating up against the supermarket wall.
He approached them and remonstrated with them about their behaviour.
The men started shouting back at him and in the end Stephen Chapman picked up Mr Kerr by the shoulders and threw him to the ground.
He died in hospital from broken ribs and pneumonia.
Chapman was given a public protection sentence, which will mean he will have to satisfy a parole board that he is safe to be released into the community after the two years, or remain in prison.
Isobel Day, Mr Kerr's daughter, said the two-year sentence was not long enough.
"A life has been wasted by a thug who couldn't keep his hands to himsellf.
"We will never forgive him for what he has done to our dad, and a grandad, and a great granddad.
"Words can't express what we live with everyday because of him," she said.
Det Insp Andy Lee of Leicestershire Police said people thinking of tackling anti-social behaviour by themselves should assess the situation carefully.
"Each set of circumstances has to be taken on its own merits, members of the public have to assess their capabilities, the circumstances and then make a decision on each individual episode.
"He (Mr Kerr) was a big, burly character and I'm sure that he thought he was doing the right thing. Clearly, in hindsight, his family and members of the community may wish that he had done things a little differently."