The teenager drowned after he was allegedly pushed into the river while playing around with a group of friends on a pontoon boat just outside of Paris.
The incident took place in Issy-les-Moulineaux, an area in the southwestern suburban area of the French capital in the Hauts-de-Seine department on Thursday, according to the latest reports.
At 7 pm, the boy's body was found at the Theodore Roosevelt quay in Issy-les-Moulineaux.
The exact details of the incident are currently unknown.
However a 15-year-old is in custody and a manslaughter investigation has been opened.