He was known to have unofficial dispensation to discuss taboo topics with Leto, because Leto was fond of him. He apparently possessed some special insight into Leto and his Golden Path.
At some stage, Malky was recalled to Ix. Shortly thereafter, Malky's niece, Hwi Noree, was sent to take his place. Upon Hwi's arrival on Arrakis, it was discovered that Malky was involved in Hwi's conception and development.
When it had been announced that Leto and Hwi were to wed, Malky was recalled to Arrakis by Leto, and murdered by Moneo Atreides, the God-Emperor's majordomo.
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