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A man in his 30s has been arrested after another man was found with serious head injuries in Norwich.
An ambulance was called to Clapham Woods, off Drayton Road, just before 05:15 and the man was pronounced dead at the scene.
The arrested man was taken to Great Yarmouth police station for questioning.
Det Insp Lewis said: "We believe this to be an isolated incident where the victim and suspect are known to each other.
"I would like to hear from anyone who may have seen any suspicious activity in the area of Clapham Woods in the early hours of this morning.”
Norfolk's Chief Constable has praised people for following social distancing rules this Bank Holiday weekend.
Simon Bailey said Saturday and Sunday didn't see many people out, but Monday's high temperatures did and saw people largely following the guidelines.
"We might not like it but we all, I think, understand the importance of it," said Mr Bailey.
His comments were supported by the chief executive of the Broads Authority, John Packman, who said "it was very good news" that despite many motor cruisers, boats and canoes being on the water this weekend, people observed social distancing rules.
The head of a police force has said the recent "shift" in people visiting coastal towns is "concerning".
To cope with the additional visitors expected in Norfolk this bank holiday weekend, more police will be on hand to enforce social distancing.
Simon Bailey, chief constable of Norfolk Police, said local people were being put at risk.
"This last few days there just seems to have been a shift and it's a shift that really concerns me", he said.
BBC Radio Norfolk
A police chief says his officers are now dealing with “far more” people heading for east coast resorts, and he is concerned this might spread Covid-19.
Norfolk’s Chief Constable Simon Bailey said there was a risk to local communities from people travelling to the county’s coastal towns.
Officers were facing a huge challenge where social distancing was not being observed in the hot weather during the coronavirus lockdown, he said.
“We are putting ourselves at risk by failing social distancing. We are actually dealing with far more people now heading for the coast," he said.
Mr Bailey said he was very concerned that, after some rules were relaxed, some people felt they could do what they wanted and that the coronavirus challenge had passed.
“There is a sense that the lockdown has been lifted," he said.
Police in England and Wales have said they've given out more than 14,000 fines for breaches of lockdown laws.
The figures, from 27 March to 11 May, show the most fixed-penalty notices - 906 - were handed out in London by the Metropolitan Police.
After the Met, the Thames Valley force, which includes Buckinghamshire, imposed the next highest number of notices at 866.
Norfolk was in the top third of forces issuing fines - 320 in total.
As we head into the VE Day Bank Holiday weekend, a chief constable is reminding everyone to "adhere to the guidance" over lockdown, amid speculation that some rules could be relaxed.
Simon Bailey, from Norfolk police, said since we did not know what Prime Minister Boris Johnson was set to say in his address to the nation on Sunday "...let's not go and let ourselves as a county down."