  :I'm no right-winger or conspiracy dunce, but I found a couple of publications that reference.  I'm open to being disproved, but apparently,  just wants to delete any mention of it, ref or no, using mere tu quoque arguments that since some sources may be anti-semitic/nazi in nature, the claims of poisoning are thereby untrue.  I will admit though that it's been horribly difficult finding any alternative, more reputable reference to the exact causes of his death and claims of assassination attempts.  Might actually have to go to a real library to discover this.    