personal curiosity at work here, thus, the research.
assassination is murder, with important consequences.
the level of importance of the murdered person is ambiguous, be he haloed by fame or infamy. it's just that assassination involves any prominent person whose murder has political, religious, ideological, or military repercussions. the assassin need also have any of these motives for the murder to be called an assassination. (a president who's killed by rat poison that's mistaken by his private cook for a flour mix is not assassinated.)
a prominent businessman is murdered, not assassinated.
a mayor of a remote town may be assassinated by a political rival as far as the locality is concerned. he may be reported as murdered at the national level.
Linkback:
https://tubagbohol.mikeligalig.com/index.php?topic=36384.0