score:13
I wrote an essay on him last year, and didn't see a single reference to him dying of unnatural causes in any of the following works:
Hodgkin, Italy and her Invaders 376-814: Volume 3: The Ostrogothic Invasion 476-535 (New York: Russel & Russel, 1880-1889)
S. J. B. Barnish, Cassiodorus: Variae, (Liverpool: Liverpool University Press, 1992), 90-93
Mark J. Johnson, “Toward a History of Theoderic's Building Program”, Dumbarton Oaks Papers, 42, (1988)
Jonathan J. Arnold, “Theoderic, the Goths, and the Restoration of the Roman Empire”, Ph.D. diss., The University of Michigan , 2008)
Goffart, Walter, “Rome, Constantinople, and the Barbarians”, The American Historical Review, 86, (1981) 275-306
Hutchinson, Paul; Mark, Robert. "On the Structure of the Roman Pantheon." The Art Bulletin, 1986: 24-34.
Sanford, Eva Matthews. "The Destruction of Ancient Rome." The Classical Weekly 40, no. 16 (1947): 122-127.
Upvote:5
I found a number of different sources that all seem to indicate that he died of old age in his own bed in Ravenna. However, it also appears that he was concerned that Justinian might have been trying to have him killed, because he had become increasingly paranoid about conspiracies. He apparently had a man named Boethius imprisoned and executed on charges of treason which later proved to be false. Theodoric died repentant and remorseful for this act at the ripe old age of 75.
http://www.themiddleages.net/people/theodoric.html
http://www.publicbookshelf.com/public_html/Outline_of_Great_Books_Volume_I/theodoric_ei.html