I'm tired of fighting, Dash. I guess this thing is going to get me.
Source, in full
Last words, to his brother Theo, in Grace Hospital of Detroit, Michigan (30 October 1926), quoted in Houdini, The Man Who Walked Through Walls (1959) by William Lindsay Gresham, p. 286, and in Final Séance : The Strange Friendship between Houdini and Conan Doyle (2001) by Massimo Polidoro, p. 204