Is it me or the "apparent" in the title implies it looks like a suicide but is not conclusively one?
an experienced or well trained LEO may see a subtle detail indicating involvement, or not of other person, setting the tone for investigation or threat response.
an autopsy may turn that around if it ends up that a weapon was held in a position quite unlikely for decedent to achieve.
the overarching consideration is a planned murder is not in any way beneficial to boeings situation
So anything short off enough evidence to secure an quick conviction of some disposable culprit will we bend into whatever shape is needed to support an "suicide" or "accidental death" finding by the prosecutor/coroner in charge regardless of what the investigating detective think is the most likely explanation.