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.
More top news
As the investigation into Khalid Masood continues, former acquaintances tell of violent incidents in the murderer's past.
Simon has Saturday's forecast for the west of the region
Simon has Saturday's forecast for the east of the region