“Guilt is perhaps the most painful companion of death.”
Source: On Death and Dying (1969), Ch. 9
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Elisabeth Kübler-Ross 26
American psychiatrist 1926–2004Related quotes

“For it is not death or pain that is to be feared, but the fear of pain or death.”
Book II, ch. 1 http://classics.mit.edu/Epictetus/discourses.2.two.html
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Variant: For death or pain is not formidable, but the fear of pain or death.

As translated in The Portable Nietzsche (1954) by Walter Kaufmann, p. 96

Book Two, Part IV “War March”, Chapter 3 (p. 246)
The Birthgrave (1975)