In a post-conviction sentencing proceeding, does the prosecution's duty to disclose exculpatory evidence apply?

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The obligation to disclose exculpatory evidence rests on preventing an unjust conviction or punishment during the live criminal proceeding. That duty is tied to the trial and any direct review that looks at the trial itself, ensuring the government does not withhold information that could affect guilt or sentencing at that stage.

In a post-conviction sentencing proceeding, the matter is a collateral attack on a completed conviction rather than a new or ongoing prosecution. There’s no ongoing trial to influence, and the purpose is to review whether the original proceedings violated due process or other constitutional rights. Because the Brady-style obligation is anchored to the live trial (and direct review of that trial), it does not automatically extend to post-conviction sentencing. If new issues arise in post-conviction relief—such as newly discovered evidence or ineffective assistance of counsel—those are governed by separate post-conviction rules, not the general Brady discovery duty.