::::::We're going in circles. I saw your opening comment already, and I've already explained why COMMONNAME appears to be against "assassination," which is "how this article is different" than yours.  I could just as easily link to the 440 articles that start with "murder of" and ask you why this article is different; it's pointless.  Even if every single other article on a political death used "Assassination of", it would still be irrelevant to *this* article, WP:OTHERSTUFF. 
 ::::::I'll double-check and see if there's been a shift the past few days, then open a RM if the sources continue to appear to prefer "murder" so strongly.