Last updated: October 27, 2026
The funeral was last week, and the house feels too quiet. Now your family has questions no one at the kitchen table can answer. What really happened? Was it someone’s fault? And if it was, what would you have to show?
How do you prove wrongful death? In Washington, your family’s lawyer has to show four things. Someone owed your loved one a duty of care, they broke it, the death resulted, and your family suffered losses. You don’t need a criminal conviction. A civil jury asks which side’s evidence is more convincing.
The short answer: You prove wrongful death the same way you prove carelessness in any injury case: duty, breach, cause, and losses. The proof comes from witnesses, records, and specialists. The standard is lower than in a criminal case. In Washington, the personal representative of the estate brings the case for your family.
How do you prove wrongful death?
By proving four things. First, the other person owed your loved one a duty, like a driver’s duty to drive with care. Second, they broke that duty. Third, breaking it caused the death. Fourth, your family suffered losses. Washington’s Supreme Court lists these four parts for any carelessness claim, and a death case uses them too.
| What you must show | What it means | Example in a car crash |
|---|---|---|
| Duty | The other person had to act with care | Every driver must drive safely |
| Breach | They didn’t | The driver ran a red light while texting |
| Cause | The breach led to the death | The crash caused the fatal injuries |
| Losses | Your family was harmed | Lost support, funeral costs, the loss of a parent |
Lawyers call these the four key elements: duty, breach, causation, and damages. Knowing how to prove wrongful death is about these four parts. Your lawyer builds proof for each one, and your family’s records fill in the last.
How much proof does a wrongful death case need?
Less than a criminal case. Washington’s courts explain that civil cases are decided on a preponderance of the evidence. That means your family’s evidence has to be more convincing than the other side’s. A criminal case needs proof beyond a reasonable doubt. That’s why a family can win a civil case even when no one was convicted.
| Criminal case | Wrongful death case | |
|---|---|---|
| Who brings it | The prosecutor | The estate’s personal representative |
| Standard of proof | Beyond a reasonable doubt | More convincing than the other side’s evidence |
| What it can lead to | Jail, fines, probation | Money for your family’s losses |
| Depends on the other case? | No | No. A conviction isn’t required |
What evidence helps prove wrongful death?
Anything that shows what happened and why. In a crash, that’s photos, witness accounts, vehicle data, and the scene itself. Medical records and the death certificate tie the injuries to the death. Specialists, like crash reconstruction engineers or doctors, often explain it to a jury. Pay stubs and family records show what your family lost.
- Keep every photo, video, and message about the crash or incident.
- Write down the names of witnesses and anyone who helped.
- Get the death certificate and medical records.
- Save pay stubs, tax returns, and household bills.
- Don’t let the vehicle be scrapped or repaired before it’s inspected.
The police report helps, but Washington law keeps required collision reports out of trial. The facts behind it still count: the people, the photos, and the measurements. (RCW 46.52.080) See claiming a crash without a police report.
Does a traffic ticket or DUI prove fault?
A ticket helps but doesn’t settle it. In Washington, breaking a traffic law isn’t automatically carelessness. A jury can treat it as evidence of carelessness. Driving under the influence is different. The law treats that breach as carelessness on its own. Your family still has to show the breach caused the death and the losses that followed.
That rule is in RCW 5.40.050. Where the cars hit can also point to fault. See determining fault by the location of damage.
What are common causes of wrongful death?
Traffic crashes are a big one. Washington lost 810 people in traffic crashes in 2023, by the federal count. Drivers, passengers, pedestrians, and riders were all among them. Deaths from medical care follow a separate law that asks whether the provider met the accepted standard of care. Unsafe property and defective products can also lead to these claims.
Who died in Washington traffic crashes, 2023
For deaths from medical care, your family must show the provider didn’t use the care a reasonably prudent provider would, and that this caused the death. (RCW 7.70.040)
Who can file a wrongful death lawsuit in Washington?
The personal representative of your loved one’s estate. That’s usually a family member a court appoints. The case is brought for the family members the law names: a spouse or domestic partner and children, including stepchildren. If there are none, parents or siblings. Parents of a child have their own claim in some cases.
Read who gets the money in a Washington wrongful death settlement. (RCW 4.20.020; RCW 4.24.010)
How long does a wrongful death lawsuit take?
There’s no set length. Most Washington claims must be filed within three years. Once a lawsuit is filed in King County, the court issues a case schedule with a trial date. The schedule sets a deadline to try mediation or another settlement process, eight weeks before trial. Many cases settle along the way, and some go to trial.
- Investigate. Gather records, witnesses, and opinions from specialists.
- File. The personal representative files the lawsuit.
- Exchange evidence. Both sides share records and take depositions.
- Try to settle. Mediation before trial.
- Trial. If it doesn’t settle, a jury decides.
Sources: RCW 4.16.080 and King County LCR 4. See whether mediation is legally binding.
What if your loved one was partly at fault?
Your family can still recover. Washington divides fault by percentage. If a jury finds your loved one partly at fault, the money goes down by that share. It doesn’t drop to zero. That’s why the other side often argues about fault, and why early proof matters so much in these cases.
That rule is RCW 4.22.005. When we take a death case, Rich handles it himself and prepares it for trial from the start. That means gathering the proof as if a jury will see it.
FAQ
Do we need a criminal conviction to prove wrongful death?
No. The civil case is separate, and its standard of proof is lower. A family can win even if no charges were filed.
Can you sue a hospital for wrongful death?
Yes. Washington’s medical care law applies. Your family must show the care fell below the accepted standard and caused the death.
What if there were no witnesses?
Physical evidence can carry the case. Vehicle data, scene photos, and crash reconstruction often show what happened.
Is a wrongful death claim the same as a survival claim?
No. A wrongful death claim covers your family’s losses. A survival claim lets the estate recover the person’s own losses before death.
What does No Win, No Fee mean?
You pay nothing up front. Our fee comes out of the money we win for you. No hourly bills. No retainer. If we don’t win, you owe us nothing. Not even the case costs.
Talk to Rich about your family’s case
How do you prove wrongful death? With evidence gathered early and carefully. If your family lost someone because of another person’s carelessness, call Rich Martin. He has handled more than 2,000 injury cases in 28 years and taken more than 30 to a jury. He was named to the National Association of Distinguished Counsel’s Nation’s Top One Percent in 2023 and 2024.
We help families in Bellevue, Seattle, Tacoma, and across Washington. Your case review is free. No Win, No Fee. We speak English and Korean.
Call (425) 635-2000 or see how we handle wrongful death cases.
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