A 16-year-old male was arrested in Saitama Prefecture on Thursday for his alleged involvement in the death of another teenager of the same age who was found naked and partially buried in a dry riverbed in the prefecture, police said.

The teen owned up to the charge, saying he killed Tsubasa Inoue because "he told lies and ignored phone calls and text messages," the police said.

Inoue was found Tuesday morning in the Toki River in Higashimatsuyama, Saitama Prefecture, with his lower body and the left side of his upper body buried in gravel on the dry riverbed. An autopsy determined that Inoue drowned, they said.