English resources/Dr Jekyll and Mr Hyde/Dr Lanyon
A doctor, Jekyll's old friend. He sees Hyde become Jekyll. It kills him.

4 quotes by or about Dr Lanyon, in the order they happen.
I have had a shock," he said, "and I shall never recover.
Lanyon · Chapter 6: Incident of Dr Lanyon · science · secrecy
Lanyon has seen something. He will not say what. He dies of it.
I wish to see or hear no more of Dr. Jekyll
Lanyon · Chapter 6: Incident of Dr Lanyon · reputation · secrecy
Lanyon cuts Jekyll off completely. Whatever he saw was too much.
O God!" I screamed, and "O God!" again and again
Lanyon · Chapter 9: Dr Lanyon's Narrative · science · religion · duality
Lanyon watches Hyde drink the potion and turn into Jekyll. He cannot stop screaming.
My life is shaken to its roots
Lanyon · Chapter 9: Dr Lanyon's Narrative · science
What Lanyon saw broke everything he believed. Science, God, all of it.