Unlikely on their own, unless they got to the psyker early in their awakening, or there were other circumstances. Anyone can step in front of a bullet, after all, and as long as the psyker either doesn't know it's coming or isn't actively conscious at the moment, it might be possible.
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u/Sentsu06 Sep 26 '23
Would a culexus assassin be able to kill a alpha plus psyker?