A man has been charged with the manslaughter of a paratrooper who died in hospital a week after he was attacked in Northampton.
Rory McWilliams, 20, a medic and soldier, was assaulted in St Peter's Way car park on 6 February.
He received a brain injury and died on 12 February.
A 25-year-old man from Northampton is due before magistrates in the town next Thursday. Police said they were trying to trace a key witness.
The young man is known to have been sitting on the kerb, near Domino's Pizza, police said.
He apparently wanted directions to the nearby Fever nightclub, where he may have been meeting up with somebody else.
Police said they know the man attended Fever shortly after the incident.
Officers are also keen to speak to anybody who was in the smoking area of the nearby BASE club, which overlooked the scene of the incident.
A second 25-year-old man, who was arrested on suspicion of murder on 17 February, has been bailed pending further inquiries.
Both men had previously been arrested on suspicion of inflicting grievous bodily harm in connection with the incident and were released on bail.