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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Wednesday lunchtime's weather for the east of the region
Wednesday lunchtime's weather for the west of the region
There is a high risk from birch pollen during any good weather. Oak pollen is also on the increase.