Colorado Judge Flags Suppressed Evidence in 2008 Arson-Murder Verdict
A Colorado judge found prosecutors suppressed evidence in a 2008 arson and murder case.
Why it matters: The ruling could prompt a new trial and signals heightened scrutiny of past arson convictions, spotlighting prosecutorial duties and forensic standards important for defense teams evaluating wrongful conviction risk.
- Judge R. Michael Mullins ruled that exculpatory evidence was withheld in Deborah Nicholls' 2008 trial.
- A 2007 state report found no ignitable liquids in fire debris, challenging the arson theory.
- Nicholls was convicted in 2008 for a 2003 fire that killed her three children.
- The suppressed evidence met the Brady v. Maryland materiality standard, raising questions about the verdict.
A Colorado judge's recent findings call into question the integrity of the 2008 conviction of Deborah Nicholls, who was sentenced for an arson and triple homicide after a fire killed her three children in 2003. On April 28, 2026, El Paso County District Judge R. Michael Mullins ruled prosecutors suppressed critical exculpatory evidence in her trial.
- The undisclosed evidence included a 2007 Colorado Bureau of Investigation (CBI) report stating no ignitable liquids were found in debris from the fire, undermining the prosecution's arson narrative. This contradicts earlier testimony about the presence of flammable substances.
- Multiple experts have since challenged the prosecution's claim that flammable xylenes were tied to arson, reflecting changes in fire forensics documented in high-profile wrongful conviction cases like Cameron Todd Willingham's. (Learn more here.)
- Judge Mullins held that the suppressed report was material under Brady v. Maryland, indicating a reasonable probability the verdict would have differed if disclosed. He did not specify next steps or a date for a potential evidentiary hearing.
Attorneys for Nicholls welcomed the decision. "This ruling confirms what we have argued for years: there was no reliable scientific evidence of arson," said Janene McCabe, Nicholls' attorney. Kathleen Lord of the Korey Wise Innocence Project also stated, "Deborah Nicholls has spent more than eighteen years in prison because the government hid evidence that could have set her free."
The case underscores both the stakes for those convicted on forensic evidence later found unreliable and the evolving expectations around prosecutors’ obligations to disclose all pertinent information. For defense lawyers, the developments urge close scrutiny of expert testimony, especially as fire science continues to evolve.
For additional details on the court's findings, see Courthouse News and KKTV's coverage.
By the numbers:
- 18+ years — Deborah Nicholls has been incarcerated after her 2008 conviction.
- 3 — Children who died in the 2003 house fire.
- 2007 — Year of the CBI report finding no ignitable liquids.
Yes, but: Details about the scheduled evidentiary hearing and the prosecution's official response remain unavailable.