Kayden Smith, 27, of Belmont Close, Hassocks, has been charged with murder.
Mr Smith, who is unemployed, will appear before Haywards Heath Magistrates Court on Saturday, 11 August.
The victim, who has yet to be officially identified, is believed to be Jan Jensen, 52, who was visiting the UK from Denmark. Police on Thursday, 9 August, were called to a flat in Belmont Close, Hassocks, after a report of an assault and found the body of Mr Jensen. It is believed he died shortly before police arrived. The two men are thought to have known eachother.
A police spokesman said: "A postmortem examination has revealed that Mr Jensen suffered a single stab wound to his chest. Mr Jensen's family have been informed and we have recovered a knife from the scene."