Yes.
That was easy, wasn't it.
Unfortunately Yes is not very useful as I have already said
No
You have a problem with my no, I have a problem with your yes, because both cannot be right.
To solve this problem we have a discussion, each bringing up facts. Like Caliban, even if he wants to pretend I don't exist.
So you say yes, I say No, I say no because of all the reasons I have named. Now I ask
WHY THE HECK DO YOU SAY YES?
Your failure to answer or even attempt to do this shows that you have only contempt for the truth and consider your answer above it.
All other things that cause instant death tend to do it directly. Phantasmal Killer does it indirectly - it creates an illusion that might scare you. If you're scared you might drop dead from fright. Thus, I don't consider it a "death effect". Is death ward going to protect you from a heart attack? I don't think so, and it's this that kills you, not the phantasmal killer itself.
I contend that Phantamal killer is pretty darn direct. Adding flavor words to the mechanics does not change a spell.
Heart Attack is extrodinary, Death ward clearly says magical, from a magical heart attack, yes it would. As it is I could claim that is exactly what finger of death does. Afterall, it lacks any description of its own.
It would explain the 3d6+caster level damage quite fine...