[sobkas]

If death is a suicide it doesn't automatically means that third parties weren't involved. It's possible to push (temporally) vulnerable people over the edge, even if when helped/left alone they wouldn't.

Especially if one party have incentive to discredit/destroy such person, so court/jury won't take their testimony seriously(or there will be no testimony at all). After all it's almost impossible to connect such actions with subsequent suicide.

While suicide is by definition action of individual, what leads to it isn't always the same.