A 16-year-old Venezuelan national was on Sunday murdered at about 04:00hrs at Tabatinga, Lethem, Region Nine.
According to the police, Alberto Inima and another male were at a shop when an argument ensued and they subsequently left.
The police said Inima was later found with wounds about his body in Tabatinga Creek. He was taken to Lethem Regional Hospital, where he was pronounced dead on arrival.
Investigators are yet to ascertain what was used to inflict the wounds.
The suspect is in custody assisting with this investigation.