Beechbone died 3019 of the Third Age in Isengard. The cause of death was died in the Battle for Isengard.
Sméagol was born in 2440 in Vales of the river Anduin. He died 25 March 3019 of the Third Age in Mount Doom, Mordor, Middle Earth. The cause of death was Fell into the fire at Mount Doom.
Déagol was born in Vales of the river Anduin. He died in Banks of the river Anduin. The cause of death was Strangled by Sméagol, after Déagol found the One Ring.