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The role Friar John played in the catastrophe in "Romeo and Juliet" is that he was prevented from delivering Friar Laurence's letter.
Who is Friar John?
Friar John is a minor character in Shakespeare's play "Romeo and Juliet," by who ends bringing grave consequences to the story. It turns out he fails to deliver a letter to Romeo that revealed Friar Laurence and Juliet's plan.
The letter would reveal that everyone thinks Juliet is dead when she is actually alive. She has simply taken a potion that makes her look dead so that she could escape her family to be with Romeo. Since Friar John is prevented from delivering the letter, Romeo ends up taking his own life thinking he has lost Juliet.
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