Answer:
Farquhar has been hanged.
Step-by-step explanation:
It later on continues with "Peyton Fahrquhar was dead; his body, with a broken neck, swung gently from side to side beneath the timbers of the Owl Creek bridge". The idea that "all is darkness is silent" pinpoints exactly when it happened. Moments before he died, he was seeing different moments of his life, and then nothing but the silent blackness of death.