A man has died in hospital the day after he was assaulted at a Merseyside shopping village, police said.
Officers were called to reports of an altercation between four men at about 1.30pm on Thursday at Cables Retail Park, Prescot.
Jonathan Fitchett, 22, who comes from Prescot, died after suffering serious head injuries.
Police said a 27-year-old man from Prescot has been arrested on suspicion of murder and is being questioned.
A post-mortem examination will take place over the weekend to establish the cause of death, officers confirmed.
A car believed to have been used by the offenders has been seized and is being examined.
Det Ch Insp Steve Cox said:"This is a tragedy for everyone who knew Jonathan and our sympathies are with his family and friends at this very sad time.
"We are treating his death as murder and the large-scale investigation that was already underway following his assault will continue until all the people involved have been caught.
"We are following a number of positive lines of enquiry and we are actively seeking the offenders involved in this incident.
"I would urge anyone in the area with information about this incident to contact us and tell us what they know and I would also call on the people involved in attacking Jonathan to do the right thing and step forward and tell us what happened."