Déagol

Déagol was a cousin of Sméagol. On one of Sméagol's birthdays, they both went fishing, and Déagol was pulled underwater by a big fish. It was then that he discovered the Ring, half-buried in the river-bed. When Sméagol saw the Ring, he wanted it, and strangled Déagol to get it. (The Lord of the Rings: The Return of the King)