In Act 4 Scene 7, Queen Gertrude reports that Ophelia had climbed into a willow tree (There is a willow grows aslant the brook), and that the branch had broken and dropped Ophelia into the brook, where she drowned. Gertrude says that Ophelia appeared "incapable of her own distress".

What river did Ophelia drown in?

He reports this story, and Samuel Schoenbaum repeats in his own book Shakespeare's Lives. It runs that a young woman drowned in the Avon, near the village of Tiddington, a mile or so up the river from Stratford, on 17 December 1579.

Why did Ophelia kill herself?

Ophelia kills herself because the fate of Denmark is placed on her shoulders when she is asked to more or less spy on Hamlet, her father has been murdered (by her former lover no less), from the confusion created by her father and brother with regard to the meaning of love, and her suicide is even an act of revenge.