A.J. Armstrong: Judge Denies Fourth Trial Request After Dispute Over Forensic Expert

A.J. Armstrong: Judge Denies Fourth Trial Request After Dispute Over Forensic Expert

Published October 28, 2026. This report concerns a judge’s ruling after an evidence-disclosure hearing. It is not a new murder trial.

The Court’s Decision, Simply Explained

Antonio “A.J.” Armstrong Jr. was convicted of killing his parents, Dawn and Antonio Armstrong Sr., in their Texas home in 2016. Two earlier trials ended without a verdict. A third jury found him guilty of capital murder in 2023.

On Wednesday, October 28, Judge Kelli Johnson denied Armstrong’s request for a fourth trial. His lawyers had argued that prosecutors failed to give the defense information about a complaint against a forensic expert who testified at the third trial. The judge agreed the defense had not known about the complaint before the verdict, but decided the undisclosed complaint did not meet the legal test for a new trial. Armstrong’s conviction remains in effect. His lawyer said he intends to keep challenging it.

Why It Matters

A defendant has a right to receive certain important evidence that could help the defense. But not every piece of information withheld before trial leads to a new trial. The court must examine whether it was favorable to the defense and whether it was important enough to affect the result. This ruling makes that distinction central to Armstrong’s continuing appeal. It does not mean the court held another murder trial or that a new jury reached a verdict.

Two parents were killed, and their deaths remain the reason this case exists. Explaining the legal challenge carefully respects their lives while also explaining Armstrong’s right to contest his conviction.

Go Deeper

What happened in the three trials

Dawn Armstrong and Antonio Armstrong Sr. were fatally shot at home in 2016. Their son was 16 at the time. The 2019 and 2022 trials ended with juries unable to agree on a verdict. At the third trial in 2023, jurors convicted him of capital murder.

Because Armstrong was a minor at the time of the killings, he received a life sentence with the possibility of parole after 40 years. This does not mean he has already served 40 years, and it does not guarantee release. The distinction matters because some brief accounts describe the sentence only as “40 years.”

The complaint involving Celestina Rossi

Forensic expert Celestina Rossi reviewed evidence in the case after the earlier trials. Houston reporting says she identified dried blood on a shirt, testimony that became important to the prosecution. A separate 2019 complaint to the Texas Forensic Science Commission accused her of planting evidence in another case. The complaint was later dismissed. The allegations in that complaint were not proved at this week’s hearing.

Armstrong’s lawyers said they were not told about the complaint before his third trial. They argued that knowing about it could have changed their questioning and challenges to Rossi’s testimony. The disputed information involved an unrelated case. It should not be reported as a court finding that she planted evidence in the Armstrong investigation.

What the October 27 hearing examined

On Tuesday, October 27, Judge Johnson heard witnesses and reviewed email exchanges between prosecutors and the forensic expert. The defense sought to show that the complaint could have helped its trial strategy. A defense lawyer described how disclosure might have changed cross-examination. The State argued that the accusation was unproved and not enough to undermine the jury’s verdict.

Johnson had been directed to hold a hearing by the Texas Court of Criminal Appeals. That higher court had not granted Armstrong a fourth trial. It ordered the lower court to consider the evidence-disclosure question.

What the judge actually decided on October 28

Johnson said the complaint had not been given to the defense before the verdict. She also found that the defense had not shown the complaint’s allegations were true. The judge concluded that the complaint did not amount to favorable, material evidence whose nondisclosure violated the rule associated with the U.S. Supreme Court’s decision in Brady v. Maryland.

A Brady violation means prosecutors failed to turn over important evidence favorable to the accused. The judge found that this complaint did not qualify. She also concluded that learning about it would not have changed the trial’s outcome. The ruling denied this request for a fourth trial, not every possible future legal challenge.

What each side says now

Harris County District Attorney Sean Teare defended the original conviction and the prosecutors’ conduct. Armstrong’s attorney Patrick McCann said he disagreed with the judge’s materiality decision and intended to continue litigation. Those are the parties’ positions. Neither statement replaces the court’s actual ruling.

What happens next

Armstrong’s legal team may pursue further review through the appellate process. No new trial date or new appeal ruling is established by the sources used in this article. The next verified step will be a filed order or appellate action. The guilty verdict and existing sentence remain in place in the meantime.