I don't think it matters. Both terms have their strengths. Using the term "assassinated" elevates the victim, which works to justify the unequal allocation of resources for investigation of a rich guy's death.
Also the term "murder" doesn't imply justification, only that you killed someone on purpose.
Using the term "assassinated" elevates the victim,
More than his role has been? Assassinated puts questions on why high-level figures like him get targeted, and these questions are uncomfortable, to say the least