A 16-year-old boy has been arrested after a man's body was found in a street in Littlehampton.
The 51-year old man, who was from the local area, was found in Gladonian Road at about 06:00 GMT on Sunday, Sussex Police said.
He was pronounced dead at the scene and his next of kin have been informed, a police spokesperson said.
The 16-year-old boy from Littlehampton has been arrested on suspicion of murder.
Det Supt Andy Wolstenholme, has called for anyone who was in Gladonian Road between midnight and 06:00 on Sunday to contact Sussex Police.
He added: "It would also support the investigation if any social media posts did not speculate about what happened."