Two men have been arrested on suspicion of the murder of dad-of-seven Colin Richards.
The 48-year-old died after being stabbed in the leg, an inquest previously heard.
He was found unconscious in Snowdon Road, Ely, after a disturbance was reported in the Caerau area just before 23:30 BST on 7 April.
The men, 26 and 18 and from Cardiff, were arrested in Stoke-on-Trent, Staffordshire.
They are in police custody.
Mr Richards' family has been told and are being supported by officers.