Police investigating the murder of a Flintshire man found injured on Chester city walls a week ago are handing out leaflets appealing for information.
Christopher Garwell, 23, of Connahs Quay, was found with severe head injuries on Thursday 3 June and died in hospital in Liverpool on Wednesday.
One man and three teenagers from Chester are being questioned by Cheshire Police.
Officers will distribute appeal leaflets on Thursday.
Detectives were initially unsure whether Mr Garwell had been attacked or had been injured accidentally in a fall.
But a police spokesman said they now believed Mr Garwell was involved in an incident in the Charlotte Court area of the city, close to the canal, before he was found collapsed near the King Charles Tower on the city walls.
It is thought he was known to his assailants.
Police believe they ran from the city walls in the company of two females and headed onto the canal tow path in the direction of Blacon.
One man aged 20, and three youths one aged 17 and two 16-year-olds, have been arrested on suspicion of murder.
On Wednesday evening magistrates granted police another 24 hours to continue questioning them.
Mr Garwell died at Liverpool's Walton Centre, a specialist neurological hospital, after doctors lost their battle to save him.
Detectives are appealing for witnesses to the incident and anyone who may have been in the area between 1850 BST and 2000 BST on Thursday 3 June to contact them on 0845 458 0000.