Gardaí have said that, shortly after 9pm on Friday 31 July, a man in his 30s was discovered with serious injuries at Glenaree Bridge, Rathangan, Co Kildare.
The man was taken by ambulance to Naas General Hospital where he was subsequently pronounced dead. A post-mortem is scheduled to take place at a later date and will be conducted by the State Pathologist.
Following enquiries by gardaí, a man in his 20s was later arrested. He is currently being detained at Kildare Garda Station under Section 4 of the Criminal Justice Act, 1984.
The scene is currently preserved and the services of the Garda Technical Bureau have been requested.