The body of the 29-year-old man was discovered at a house in Manor Drive, Lurgan this afternoon, Thursday, March 9.
Three people – two men and a woman all aged in their 30s – have been arrested on suspicion of murder.
Detective Chief Inspector Gareth Talbot said police found the body when they were called to the scene shortly after 2.50 pm.
He has appealed for witnesses to come forward and contact police on the 101 number
A post mortem examination will be carried out on Friday to determine how the man died.