For Edgar Allan Poe, dying did not necessarily leave a person speechless. Take “The Case of M. Valdemar.” The title character, his body decomposing into “a nearly liquid mass of loathsome — of detestable putrescence,” still manages enough tongue to beg the narrator, a mesmerist, to stop messing with him. “‘For God's sake! — quick! — quick! — put me to sleep — or, quick! — waken me! — quick! — I say to you that I am dead!’”
“The tell-tale cipher: Could a mysterious cryptograph be a final message from Edgar Allan Poe?” (2000-03-08) By Jeffery Kurz.
Source
mesmerist = a person who induces hypnosis. Hypnotizer.
putrescence = the state of offensive decay.