Because of this
That mark on his forehead? That is the Hyuga Branch Clan’s Curse Mark. Placed upon them at an early age by the Main Clan Member. And it has 2 primary purposes:
First off, it allows a Main Hyuga Clan member to control a Branch member by causing immense physical pain and possibly even killing them by destroying their brain cells
Secondly, and this is relevant to your question: It seals away the Byakugan upon their death (induced by the curse mark or otherwise) in order to prevent the dōjutsu from falling into an enemies hands
So, in short. After he died, Neji’s Byakugan was sealed away like any Hyuga Branch member’s would have been
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