Police launch an investigation after a 30-year-old man with head injuries died in Upper Rock Gardens, Brighton.
Police were alerted at 4.21am on Friday (4 July) after ambulance personnel called to the address were unable to revive the man.
A 41-year-old man, a 28-year-old man and a 24-year-old man, all from Brighton, have been arrested on suspicion of murder while enquiries continue.
Anyone with information is asked to phone Sussex Police on 101 or email firstname.lastname@example.org, quoting Operation Greehill.
Alternatively they can contact the independent charity Crimestoppers free and anonymously on 0800 555 111.