A second man has been arrested on suspicion of murder after a man was found fatally injured on a bench.
Northamptonshire Police launched an investigation after it was called to a footpath behind Auctioneers Court, Northampton, at about 06:30 BST on 1 August.
Robert Brown, 57, was found on a bench, and a post-mortem examination on 2 August found he had suffered an arm wound.
Police said a 41-year-old man from Northampton was arrested on suspicion of murder on Friday and was released on bail on Saturday.