Background
Flavio Augusto de Souza and Breno de Almeida Figueiredo were charged with aggravated homicide under Article 121, § 2º, items I, III, and IV of the Brazilian Penal Code — a provision covering intentional killing with qualifying circumstances such as treachery and use of a means that made defense impossible. A state court issued a sentença de pronúncia (the Brazilian equivalent of a committal for trial before a jury), sending the defendants to be judged by a lay jury panel. The defendants challenged that committal order through a habeas corpus petition at the STJ, arguing for their despronúncia — i.e., a ruling that the evidence was insufficient to warrant a jury trial.
Before the STJ could rule on the habeas corpus petition on the merits, the underlying jury trial proceeded. On March 17, 2026, the jury panel in case no. 0006903-16.2023.8.13.0452 returned a verdict of partial conviction, finding the defendants guilty on at least some of the charged counts. A single-justice of the STJ thereupon dismissed the habeas corpus as moot (prejudicado). The defendants filed an internal appeal (agravo regimental) challenging that dismissal.
Before the Fifth Panel, the defense argued that STJ Precedent (Súmula) No. 648 — which holds that a supervening conviction renders moot a habeas corpus petition seeking to dismiss a criminal action for lack of probable cause — should not apply to their case. They contended that the alleged procedural defect was an absolute nullity (evidence from an anonymous witness who was never subjected to cross-examination) that infected the jury trial itself, such that the conviction could not be treated as an independent legal act curing the earlier illegality.
The Court’s Holding
The Fifth Panel unanimously denied the agravo regimental and upheld the dismissal of the habeas corpus as moot. The court held that once a jury panel returns a verdict and a conviction is entered, that judgment constitutes a new, exhaustive judicial determination carrying the constitutional sovereignty of jury verdicts under Article 5º, XXXVIII(c) of the Federal Constitution. That sovereign verdict supersedes and renders legally ineffective any challenge directed solely at the earlier committal ruling.
The panel further held that Súmula 648 applies by analogy: just as a conviction moots a habeas corpus seeking to dismiss a prosecution for lack of probable cause, so too does it moot a challenge to the pre-trial committal order. The court also rejected the defense’s assertion that an absolute nullity — specifically, the use of testimony from a secret witness who was never cross-examined — could survive the conviction and be examined in this proceeding. Reviewing that claim would require extensive re-examination of the evidence, which is incompatible with the narrow scope of habeas corpus relief.
The panel noted that the proper vehicle for challenging nullities that allegedly contaminated the jury trial is an appeal to the state court of appeals under Article 593, III(d) of the Code of Criminal Procedure, not a habeas corpus petition at the STJ directed at the now-superseded committal order.
Key Takeaways
- A jury conviction is a new exhaustive judicial act carrying constitutional sovereignty; it renders moot any pending habeas corpus challenge to the earlier committal-for-trial order (sentença de pronúncia).
- STJ Súmula 648 — which moots habeas corpus petitions seeking to dismiss a prosecution after a conviction — applies equally to challenges targeting the pre-trial committal stage.
- Alleged absolute nullities (including evidence obtained without cross-examination) that purportedly infected the jury trial cannot be reviewed via habeas corpus at the STJ when doing so would require broad re-evaluation of facts and evidence.
- The appropriate remedy after a jury conviction for trial-phase nullities is a direct appeal to the state court of appeals under CPP Art. 593, III(d), not habeas corpus at the STJ.
Why It Matters
This decision reinforces a firmly established but important procedural rule in Brazilian criminal litigation: defendants who challenge their committal for jury trial must obtain relief before the jury renders its verdict. Once a jury convicts, the constitutional principle of the sovereignty of jury verdicts effectively closes the door on habeas corpus attacks aimed at the pre-trial phase. The ruling signals to defense counsel that parallel or sequential strategies — challenging the committal while allowing the jury trial to proceed — carry significant risk of losing access to that avenue of relief entirely.
The case also highlights the limits of habeas corpus as a remedy in the Brazilian system. Even where defendants allege a serious constitutional defect — such as reliance on testimony from an anonymous witness who was never subjected to adversarial cross-examination — the STJ will not use habeas corpus to unwind a jury verdict when doing so demands factual re-examination. Counsel alleging such trial-phase violations must pursue them through the ordinary appeals process rather than the extraordinary writ.