A 23-year-old student who was "out looking for trouble" has been jailed for nine years after killing a pensioner during a drunken assault.
Samuel Watts pleaded guilty to the manslaughter of 72-year-old Melvyn Hargreaves.
Mr Hargreaves, who was a father of four, was attacked in January 2015 while he was out walking his dogs with his 77-year-old partner Jean Bill.
Nottingham Crown Court was told that the pensioner was pushed by Watts and verbally assaulted after the couple's dogs barked at the drunken student.
Mr Hargreaves stood his ground and pushed back, but was then struck from behind and ended up on the pavement.
While the pensioner was on the ground, Watts let go a "flurry" of kicks and punches and left Mr Hargreaves unconscious.
Two days later the 72-year-old died from severe head injuries.
The court also heard that Watts had been drinking heavily in bars around the city and was involved in at least five altercations before the fatal attack.
Defence lawyer Peter Joyce, said his client could not remember anything about the incident but accepted responsibility.
Speaking after Mr Hargreaves' death, Miss Bill said: "I was just numb when I was told by the police he had died."