"Drunk - that's what it was - drunk... And I operated!"
Edward George Armstrong was one of ten guests invited to Nigger Island. He was the seventh to die, in the manner laid out in the poem.
Dr Armstrong was a Harley Street doctor, responsible for the death of a patient, Louisa Mary Clees, after he operated on her while drunk many years earlier.
"Edward George Armstrong, that you did upon the 14th day of March 1925, cause the death of Lousia Mary Clees."
Doctor Armstrong showed up to an operating table drunk, and killed the patient.
"A red herring swallowed one and then there were Three."
Armstrong is believed to be the murderer by Claythorne, Lombard, and Blore, but is later found washed up ashore, dead. He is pushed into the raging sea during a storm by the murderer.