A man who suffered head injuries during an incident in Seaside Road, Eastbourne has now died.
Police are now treating the case as one of murder.
Lee Molineau, 46, of no fixed address, died in the Hurstwood Park neurological unit, Haywards Heath, on Tuesday night.
He had been in a critical condition since the assault on Wednesday, July 24 and his family were at his bedside.
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Maidstone and Tunbridge Wells NHS Trust has been fined £180,000 after it burned a man who was in for a routine operation.
Thursday night's weather for the east of the region
Thursday night's weather for the west of the region