Four people are being held in connection with the murder of a man found unconscious outside a KFC restaurant in south London.
Alper Pasha, 43, was discovered in Coldharbour Lane, Brixton, on 26 May. He died in hospital on Monday.
A man, 24, was arrested on suspicion of murder on Thursday afternoon.
Three others, aged 21, 22 and 23, were arrested on suspicion of assisting an offender. All four have been taken to a south London police station.
The victim and two friends were involved in what police called an "altercation" with three other men.
Mr Pasha had been hit with a blunt object.