The letter continues describing Jekyll’s cry for help. Far from his laboratory and hunted by the police as a murderer, Hyde needed Lanyon’s help to get his potions and become Jekyll again—but when he undertook the transformation in Lanyon’s presence, the shock of the sight instigated Lanyon’s deterioration and death. Meanwhile, Jekyll returned to his home, only to find himself ever more helpless and trapped as the transformations increased in frequency and necessitated even larger doses of potion in order to reverse themselves. It was the onset of one of these spontaneous metamorphoses that caused Jekyll to slam his laboratory window shut in the middle of his conversation with Enfield and Utterson. Eventually, the potion began to run out, and Jekyll was unable to find a key ingredient to make more. His ability to change back from Hyde into Jekyll slowly vanished. Jekyll writes that even as he composes his letter he knows that he will soon become Hyde permanently, and he wonders if Hyde will face execution for his crimes or choose to kill himself. Jekyll notes that, in any case, the end of his letter marks the end of the life of Dr. Jekyll. With these words, both the document and the novel come to a close.