why did he die?
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Just after his irrepairable break with Jekyll, Lanyon fell ill. He died within days. We are not given the details of his illness.
A week afterwards Dr. Lanyon took to his bed, and in something less than a fortnight he was dead.
Dr. Jekyll and Mr. Hyde/ Chapter Six
Dr lanyon died because of seeing the transformation of Dr jekyll into Mr Hyde.Lanyon is the only person to see Hyde actually transforming into jekyll.Something that does not fit the laws of science.When sees the change he cannot cope with the fight between his common sene view of the world and what jekylls experiments reveal "I ask myself if I believe it ,and i cannot answer.My life is shaken to its roots ".Not long after he becomes mentally and physically ill,and dies.