Two more men have been arrested on suspicion of murder in Sprowston.
Police are investigating the death of Matthew Griggs who was found in Church Lane at around 7.45am on September 23.
The 38-year-old died after suffering blunt force trauma to his chest.
Police arrested a man in his 40s on October 11 and a man in his 20s on October 18 on suspicion of murder.
Two earlier arrests had been made on October 3 and 4 of two men in their 40s.
All four remain on police bail until January 2024 pending further inquiries.
Mr Griggs' body was discovered by two passing dog walkers in an area of woodland who attempted to perform CPR on him.
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Paramedics were called and took over his treatment, but he died at the scene.
Police later appealed for witnesses to two altercations Mr Griggs was believed to have been involved in during the days leading up to his death.
Both incidents occurred in Norwich on September 19 in Ketts Hill at 7.40am and later in Prince of Wales Road at 8.30am.
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