The critically injured man was found lying in Coventry Road, Yardley, at around 10.20pm on Saturday and died after being taken to hospital.
Police believe the man, in his 50s, had been assaulted just before he was found, leading to a murder investigation being launched.
A 28-year-old has been arrested on suspicion of murder and taken into police custody for questioning, West Midlands Police said.
A forensic post-mortem was due to take place to establish the cause of the death.
Anyone with any information should contact the force via live chat, by calling 101, quoting log 4401 of April 3.
Alternatively, contact Crimestoppers anonymously on 0800 555111 or at crimestoppers-uk.org