Sooner or later, everyone who follows Los Angeles death investigation ends up holding an actual autopsy report — a researcher, a journalist, a family member, a true-crime reader chasing a case that won’t let go. And almost everyone misreads it the first time. Learning how to read an autopsy report is a skill, the same way reading a court opinion or a financial statement is a skill: the document is written in a precise technical dialect, and the words do not mean what everyday English suggests they mean.

This guide walks through the anatomy of a Los Angeles County medical examiner’s report, section by section, with the goal of making you a careful reader. One scope note up front: this is about reading the document once you have it. The mechanics of requesting records from the county are their own topic. Here, we’re concerned with what’s on the page.

The Two Lines Everyone Reads First — and Misreads

Every report builds to two determinations, and conflating them is reader error number one.

Cause of death is the medical answer: the injury or disease process that physiologically ended the person’s life. “Gunshot wound of the chest.” “Acute effects of ketamine.” “Hypertensive cardiovascular disease.” It can be layered — an immediate cause resulting from an underlying cause.

Manner of death is the classification of circumstances, and in California it comes from a fixed menu of five: natural, accident, suicide, homicide, and undetermined. This is where readers stumble hardest, because the categories are terms of art:

  • Homicide means death at the hands of another — it is not a finding of murder, which is a legal conclusion only a court can reach. A justified police shooting and a first-degree murder both certify as homicide.
  • Accident covers unintended deaths, including nearly all drug overdoses.
  • Undetermined is not a shrug; it’s a disciplined admission that the evidence cannot distinguish between possibilities — most often between accident and suicide.

A careful reader treats these two lines as the conclusion of an argument, then reads the rest of the report to see how the pathologist got there.

“Deferred”: The Most Misunderstood Word in the File

Pull a death certificate in a fresh LA County case and you’ll often find the cause listed as deferred. Online, this gets spun into intrigue constantly — they’re hiding something! They are not. Deferred means the pathologist has completed the examination but is withholding a ruling until additional studies come back, almost always toxicology, which takes weeks to months.

The famous recent example is the Matthew Perry case: the medical examiner deferred the ruling at autopsy in October 2023, then released findings in mid-December once toxicology was complete — a sequence we walked through line by line in our guide to the Perry report. That’s the system working exactly as designed. When you see “deferred,” read it as “pending lab work,” not as a red flag.

The Toxicology Section: Numbers Without Narratives

The toxicology pages list each substance detected and its concentration in various specimens — blood, urine, vitreous fluid, liver tissue. Here is the most important sentence in this entire guide: a toxicology number, by itself, tells you far less than you think.

Reasons a careful reader holds the numbers loosely:

  • Postmortem redistribution. After death, drugs migrate between tissues and blood, so measured concentrations can differ substantially from levels at the moment of death. This is why specimen site matters and why pathologists prefer peripheral blood draws.
  • Tolerance. A blood level that would kill an opioid-naive person can be survivable baseline for someone with long-term tolerance — and vice versa. There is no universal “lethal level” chart that applies to every body.
  • Detection is not causation. A substance can appear in toxicology without having contributed to death at all. The pathologist weighs the levels against the autopsy findings and the scene investigation before assigning any role.

The fentanyl era has made this section more prominent than ever — as we covered in our look at how the overdose wave reshaped LA death investigation, toxicology now sits at the center of thousands of county cases a year. The interpretive caution applies to every one of them.

Contributory Conditions: The Supporting Cast

Below the cause of death, reports list other significant conditions — findings that contributed to death without directly causing it. Heart disease in a drowning. Emphysema in a pneumonia death. Obesity, diabetes, an old injury.

Readers often treat this section as either meaningless or as the “real” cause being downplayed. It’s neither. Contributory conditions are the pathologist documenting the whole body honestly: this disease was present, it mattered, but it was not the engine of death. The format itself follows national death-certification standards — the CDC’s National Center for Health Statistics publishes the framework that medical certifiers across the country, LA County included, are trained on. When mortality statistics get compiled nationally, both the underlying cause and these contributing conditions feed the data.

Amendments: When the Document Changes

Autopsy reports and death certificates are not carved in stone. The Department of Medical Examiner can amend a certification when new information arrives — late toxicology results, new scene evidence, a witness account that recontextualizes the findings, or a deferred ruling being finalized. An amended certificate supersedes the original.

For readers, two implications. First, always check whether you’re looking at the final version of a ruling. Second, an amendment is not inherently suspicious — it’s the system updating on evidence, which is precisely what you’d want it to do. Cases have moved between manners in both directions over the office’s history, occasionally years after the fact.

The Misreadings Hall of Fame

After years of reading these documents — and reading the internet reading them — here are the recurring errors to train yourself out of:

  1. Treating “homicide” as “murder.” The manner ruling assigns no legal guilt, ever.
  2. Treating “undetermined” as a cover-up. It’s epistemic honesty in a fixed-category system.
  3. Diagnosing from toxicology numbers alone. Without tolerance, redistribution, and context, the numbers mislead.
  4. Ignoring the narrative sections. The summary of circumstances and the external/internal examination findings are where the reasoning lives; the conclusion lines are just the verdict.
  5. Forgetting the human being. Every report documents the worst day of a family’s life. Reading one carefully is a form of respect; reading one for spectacle is not. That distinction is the entire editorial ethic of this site.

Master those five and you’ll read these documents better than most of the commentary you’ll find about them.

Frequently Asked Questions

What are the five manners of death on an autopsy report?

Natural, accident, suicide, homicide, and undetermined. Manner classifies the circumstances of death; it is distinct from cause of death and carries no legal finding of guilt.

What does “deferred” mean on a death certificate?

It means the pathologist is withholding the cause-of-death ruling until additional studies — almost always toxicology — are complete. Deferred rulings are routine and are finalized once results return, typically within weeks to months.

Can an autopsy report or death certificate be changed later?

Yes. The medical examiner can amend a certification when new evidence or late lab results arrive, and the amended version supersedes the original. Amendments are a normal part of the system, not a sign of irregularity.

Do toxicology levels in an autopsy report prove what killed someone?

Not by themselves. Postmortem redistribution, individual tolerance, and specimen type all affect interpretation. Pathologists weigh toxicology against autopsy findings and scene investigation before assigning any substance a role in the death.