Involuntary Manslaughter Lawyers (PC 192b)

Involuntary manslaughter under PC 192(b) carries up to 4 years in state prison. Unlike voluntary manslaughter, it is not a strike. Our San Diego defense lawyers fight to protect what matters most. Call 24/7.

A charge of involuntary manslaughter changes everything overnight. Someone has died, and the prosecution is pointing at you. The weight of that is enormous, and if you’re feeling overwhelmed right now, that makes sense.

The circumstances that lead to involuntary manslaughter charges are rarely black and white. An accidental discharge of a firearm during what should have been routine handling. A physical altercation where no one intended serious harm, let alone death. A moment of inattention by a caretaker that ended in tragedy. These are not the actions of someone who set out to kill another person, and the law recognizes that distinction.

Charges are accusations, not convictions. The prosecution still has to prove every element beyond a reasonable doubt, and that’s a high bar, especially when the core question is whether your conduct crossed the line from ordinary carelessness into criminal negligence. That distinction is where cases are won and lost.

At David P. Shapiro Criminal Defense Attorneys, we’ve defended clients facing violent crime charges throughout San Diego County, from initial investigation through jury verdict. We’ve achieved not guilty verdicts in cases others said were unwinnable, and we’ve negotiated murder charges down to outcomes that gave our clients their lives back.

Evidence fades. Witnesses forget. The window for the strongest defense is now.

Quick Reference: PC 192(b) Involuntary Manslaughter

What Is Involuntary Manslaughter Under California Law?

Penal Code Section 192(b) defines involuntary manslaughter as the unlawful killing of a human being without malice “in the commission of an unlawful act, not amounting to a felony; or in the commission of a lawful act which might produce death, in an unlawful manner, or without due caution and circumspection.”¹

What does that actually mean? Well, let’s break it down.

Involuntary manslaughter is a homicide, meaning someone died. But it’s fundamentally different from murder because there is no malice aforethought. The defendant didn’t intend to kill, and they didn’t act with conscious disregard for human life. Instead, the prosecution’s theory is that the defendant acted with criminal negligence, either while doing something unlawful (a misdemeanor or infraction) or while doing something lawful but in a reckless way.

There’s one important limitation built into the statute: PC 192(b) does not apply to deaths caused by driving a vehicle.² If a vehicle was involved, the charge falls under vehicular manslaughter (PC 191.5 or PC 192(c)), which carries different penalties and different legal standards. If you’re facing a vehicle-related charge, that’s a separate area of law entirely.

The absence of malice is what separates involuntary manslaughter from murder. And the absence of heat of passion or imperfect self-defense is what separates it from voluntary manslaughter. Understanding where your case falls in that hierarchy is critical, because the consequences at each level are dramatically different.

What Must the Prosecution Prove?

To convict you of involuntary manslaughter under PC 192(b), the prosecution must prove ALL of the following elements beyond a reasonable doubt. There are two theories under which this charge can be brought:³

Theory 1: During an Unlawful Act (Misdemeanor-Manslaughter)

1. You committed a crime that was a misdemeanor or infraction (not a felony).

The underlying unlawful act must be something less than a felony. If the underlying act was a felony, the prosecution would pursue a felony-murder theory under PC 189 instead.

2. The crime was inherently dangerous to human life, or was committed in a way that was dangerous to human life.

Not every misdemeanor qualifies. The prosecution must show that the unlawful act, by its nature or by the way it was committed, posed a real danger to human life.

3. You acted with criminal negligence.

This is the element where most involuntary manslaughter cases are fought. Criminal negligence is far more than ordinary carelessness. More on this below.

4. Your actions caused the death of another person.

The prosecution must establish that the death was a direct, natural, and probable consequence of your actions, and that the death would not have occurred without them.

Theory 2: During a Lawful Act Without Due Caution

1. You committed a lawful act.

You were doing something perfectly legal.

2. You committed that act with criminal negligence.

Even though the act itself was lawful, the way you performed it was so reckless that it created a high risk of death or great bodily harm.

3. Your actions caused the death of another person.

Same causation standard as Theory 1.

Criminal Negligence: The Key Battleground

What does “criminal negligence” actually mean? Well, this is the most important concept on this entire page, because it’s the element the prosecution struggles most to prove and the element where defense attorneys have the most room to fight.

Criminal negligence is not the same as ordinary negligence. Ordinary negligence is simple carelessness: a mistake in judgment, a moment of inattention, a lapse in awareness. Ordinary negligence can make you liable in a civil lawsuit, but it cannot support a criminal conviction.⁴

Criminal negligence requires something more. The prosecution must prove that you acted in a reckless way that created a high risk of death or great bodily injury, and that a reasonable person would have known that acting that way would create such a risk. It’s a gross departure from how a reasonably careful person would act in the same situation.⁵

That distinction between “I was careless” and “I was grossly reckless” is where involuntary manslaughter cases are won and lost. Every element is a question mark for the prosecution and an opportunity for the defense.

Involuntary Manslaughter Is NOT a Strike Offense

Here’s what many people facing these charges don’t realize, and it matters enormously.

Involuntary manslaughter under PC 192(b) is not classified as a serious felony under Penal Code Section 1192.7(c), and it is not classified as a violent felony under Penal Code Section 667.5(c).⁶ That means it is not a strike under California’s Three Strikes Law.

Now compare that to voluntary manslaughter under PC 192(a), which is a violent felony and does count as a strike.⁷

Why does this matter so much? Because a strike on your record follows you for life. A second felony conviction with a prior strike means your sentence is presumptively doubled. A third strike can mean 25 years to life. And you must serve at least 80% of your sentence before parole eligibility with a strike conviction.

For someone originally charged with murder, the difference between a reduction to voluntary manslaughter and a reduction to involuntary manslaughter is not just a few years in prison. It’s the difference between carrying a strike on your record forever and having a path to rebuild your life. That distinction drives defense strategy in every murder case where reduction is on the table.

The Murder-to-Manslaughter Spectrum

If you’re reading this page, there’s a good chance you or a loved one is currently facing a murder charge and researching whether reduction to manslaughter is possible. Let’s walk through how these charges relate to each other, because the practical differences are enormous.

See that progression? From 25 years to life down to a potential 2-year sentence. From a double-strike offense down to no strike at all. The gap between murder and involuntary manslaughter is staggering, and so is the gap between voluntary and involuntary manslaughter.

This is why defense strategy in homicide cases is so critical. The goal isn’t always acquittal. Sometimes the best possible outcome is getting the charge reduced to the lowest level the facts support, and the difference between voluntary and involuntary manslaughter can reshape the rest of your life.

Penalties and Consequences

Prison Sentences

Involuntary manslaughter is punished under California’s Determinate Sentencing Law, meaning the court selects from three fixed terms:⁸

Under Senate Bill 567, which took effect January 1, 2022, the court must impose the low term unless aggravating circumstances are proven beyond a reasonable doubt or stipulated to by the defendant.⁹ This is a significant development. It means the starting point in sentencing is now 2 years, not 3, and the prosecution has to work to justify a longer sentence.

Fines and Restitution

The court can impose a fine of up to $10,000.¹⁰ Victim restitution is mandatory. This means the defendant must pay the victim’s family for funeral and burial costs, lost financial support, and other documented losses. The amount varies case by case, but it is not optional.

Probation

Probation is legally available for involuntary manslaughter. This is not guaranteed, but it is possible depending on the circumstances of the offense, the defendant’s criminal history, and other factors the court considers. A grant of probation could mean up to one year in county jail instead of state prison, along with probation terms such as community service, counseling, and restitution payments.

Sentencing Enhancements

If certain circumstances are present, the sentence can increase significantly:

A firearm enhancement is particularly relevant in cases involving accidental shootings. A base sentence of 2 to 4 years can jump to 5 to 14 years with a firearm enhancement attached.¹¹

Defense Strategies for Involuntary Manslaughter in San Diego

The right defense depends entirely on the facts of your case. Here are the approaches we evaluate when building a defense, and we can, and will, pursue any strategy the facts support a position to do so.

Ordinary Negligence, Not Criminal Negligence

This is often the strongest defense available. The prosecution must prove that your conduct was a gross departure from how a reasonable person would act, not merely that you were careless or made a mistake. If we can establish that your actions reflected ordinary inattention or a lapse in judgment rather than reckless disregard for human life, the criminal negligence element fails. You may face civil liability, but you cannot be convicted of involuntary manslaughter.

The line between ordinary and criminal negligence is not always clear, and that ambiguity works in the defendant’s favor. Reasonable doubt lives in that gray area.

Accident and Misadventure

Under Penal Code Section 195, a killing is excusable when committed by accident during a lawful act performed with ordinary caution and without unlawful intent.¹² If the death was a genuine accident during lawful activity performed with reasonable care, no crime occurred. This defense is particularly relevant in cases involving accidental firearm discharges, workplace incidents, or recreational activities gone wrong.

Lack of Causation

The prosecution must prove that your actions were the direct, natural, and probable cause of death.¹³ If an independent intervening cause broke the chain of causation, you may not be criminally responsible. What does that look like? Well, consider a situation where the victim had a pre-existing medical condition that contributed to their death, or where medical treatment after the incident was so negligent that it, rather than your actions, was the actual cause of death. Causation is often the most contested element in involuntary manslaughter cases, especially when the death was delayed or the medical circumstances were complex.

No Unlawful Act, or Act Was Not Inherently Dangerous

Under the misdemeanor-manslaughter theory, the prosecution must prove you were committing an unlawful act that was inherently dangerous to human life. If the underlying act was lawful, or if the misdemeanor was not inherently dangerous, this theory collapses. We scrutinize the prosecution’s characterization of the underlying act to determine whether it actually meets the legal standard.

False Accusation and Third-Party Culpability

In cases where multiple people were present during the fatal incident, the defense may present evidence that another person’s actions caused the death. Third-party culpability evidence is admissible if it raises a reasonable doubt about the defendant’s guilt. We investigate every witness, every statement, and every piece of physical evidence to determine whether the prosecution has the right person.

Constitutional Challenges

Evidence obtained in violation of your constitutional rights may be suppressed, meaning the jury never sees it. We examine whether law enforcement conducted illegal searches, whether your Miranda rights were violated during questioning, and whether the investigation respected your due process rights at every stage. Suppressing key evidence can fundamentally change the prosecution’s case.

Negotiation: Reduction to a Lesser Charge

For all intents and purposes, not every case goes to trial, and not every case should. When the facts are difficult, an experienced defense attorney can negotiate for a plea to a lesser charge, potentially a misdemeanor such as negligent discharge of a firearm (PC 246.3) or battery (PC 242/243). The difference between a felony conviction and a misdemeanor resolution can be the difference between state prison and probation, between a permanent felony record and something far more manageable.

Related Charges: Understanding the Differences

Involuntary manslaughter doesn’t exist in a vacuum. It sits within a spectrum of homicide charges, and understanding the distinctions is critical for defense strategy.

Voluntary Manslaughter (PC 192(a)) involves a killing without malice but in the heat of passion or under imperfect self-defense. It carries 3, 6, or 11 years and is a strike offense.¹⁴ The key distinction: voluntary manslaughter involves an intentional killing under extenuating circumstances, while involuntary manslaughter involves an unintentional killing caused by criminal negligence.

Vehicular Manslaughter (PC 191.5 / PC 192(c)) covers deaths caused by driving a vehicle. Remember, PC 192(b) explicitly excludes vehicular killings.¹⁵ If your case involves a vehicle, you’re looking at a different statute with different elements and different penalties.

Murder (PC 187) requires malice aforethought, either express (intent to kill) or implied (conscious disregard for human life).¹⁶ Involuntary manslaughter is most commonly encountered as a lesser-included offense during murder trials. The jury receives involuntary manslaughter instructions and may convict on the lesser charge if they find the defendant caused a death through criminal negligence but without malice.

Child Abuse Resulting in Death (PC 273ab) applies when the victim is a child under 8 and carries 25 years to life. If your case involves a child, the prosecution may pursue this charge instead of or in addition to involuntary manslaughter.

Facing Involuntary Manslaughter Charges in San Diego?

Involuntary manslaughter cases turn on the distinction between tragic accident and criminal recklessness, and that distinction requires attorneys who understand how to investigate the facts, challenge the prosecution’s characterization, and present the full picture to a jury if that’s what it takes. At David P. Shapiro Criminal Defense Attorneys, we’ve defended homicide cases throughout San Diego County, from the Central Courthouse downtown to Vista, El Cajon, and Chula Vista. We’ve taken cases from investigation through verdict, and we know how to fight for the best possible outcome at every stage.

The sooner we start, the more options you have. Every day without representation is a day the prosecution works unopposed.

Call us 24/7 for a consultation. We’ll review your case, explain what you’re actually facing, and start building your defense immediately. The bottom line is this: the outcome is not predetermined, and you are entitled to a defense that matches the seriousness of what you’re up against. Protect your freedom, protect your future.