Jim Bell's guess: hydrogen cyanide.  (Hydrocyanic acid)

It only took five seconds for assassins to kill Kim Jong Nam

[1]http://nyp.st/2kOmYtb

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   [2]Sent from Yahoo Mail on Android

References

   1. http://nyp.st/2kOmYtb
   2. https://overview.mail.yahoo.com/mobile/?.src=Android