The man was taken to hospital with a head injury after being found outside a property in the Houghton Road area of Thurnscoe at around 6.55pm on Friday.
Four people - a 36-year-old man, a 34-year-old man and two 15-year-old boys - were arrested and subsequently released on bail pending further enquiries.
A fifth man, 35, was arrested yesterday (Sunday) and remains in police custody.
Formal identification and a post mortem examination are yet to take place.
Police are keen to hear from anyone with information that might help the investigation.
Call 101 quoting incident number 650 of June 5.
You can also give information to independent charity Crimestoppers anonymously via its website - www.crimestoppers-uk.org - or by calling the UK Contact Centre on 0800 555 111.