Kouri Richins Trial: Brianna Peterson — Lethal Fentanyl Dose Revealed in Court
Hidden Killers With Tony Brueski | True Crime News & Commentary
True Crime Today
3.3 • 907 Ratings
🗓️ 26 February 2026
⏱️ 52 minutes
🧾️ Download transcript
Summary
Brianna Peterson, Forensic Toxicologist, takes the stand in the Kouri Richins trial.
Kouri Richins stands accused of poisoning her husband Eric Richins with a lethal dose of fentanyl in March 2022—allegedly to collect on a $1.9 million life insurance policy she secretly increased just weeks before his death. What prosecutors describe as a calculated murder-for-profit scheme, the defense calls a tragic accident involving a man who, they claim, had a hidden drug problem.
This is gavel-to-gavel coverage of one of the most closely watched trials in Utah history. A children's book author. A grieving widow who wrote about "heaven" for kids while allegedly researching untraceable poisons. A husband who may have been killed in his own bed.
Hidden Killers brings you complete trial coverage with expert analysis—no sensationalism, just the facts as they unfold.
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Transcript
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| 0:00.0 | You're listening to continuing coverage from the trial of Corey Ridgians from the |
| 0:05.0 | Hidden Killers podcast and True Crime Today. |
| 0:08.4 | Now, back to the courtroom. |
| 0:11.4 | Hello, Dr. |
| 0:12.4 | Can you please state your full name and spell your last name for the record? |
| 0:17.0 | Brianna Lynn Peterson, P-E-T-E-R-S.O.N. Are you employed, ma'am? Yes. How are you employed? I'm a forensic toxicologist with NMS labs. |
| 0:29.8 | How long have you been a forensic toxicologist? Over 20 years. |
| 0:35.4 | And with NMS? I've been with NMS since June of 2021. |
| 0:41.3 | Okay. So you were working there in March of 2022? |
| 0:46.3 | Correct. |
| 0:47.3 | Okay. |
| 0:48.3 | What is a forensic toxicologist? |
| 0:51.3 | Forensic toxicology, you analyze biological samples for the presence or absence of drugs and alcohol. |
| 1:00.0 | And what is your education briefly? |
| 1:04.0 | I received my bachelor's degree in chemistry from the University of Wisconsin-Lacross in 1997, a master's degree in forensic |
| 1:13.3 | science from the University of Illinois at Chicago in 1999 and a PhD in toxicology from |
| 1:20.9 | the University of Georgia in 2007. |
| 1:25.7 | Since becoming a forensic toxicologist 20 years ago, have you had training, continuous training? |
| 1:34.7 | Yes. |
| 1:35.3 | So throughout my career, I've received training specific to the chemical extractions that are to be performed on the biological samples, the instrumentation that's used for the analysis, |
| 1:46.0 | and then also pharmacology for the interpretation of the drug and ethanol results, |
| 1:52.0 | and how they might apply to either impairment or a medical legal death investigation. |
... |
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