What Is DUI Manslaughter in Florida? Charges, Penalties, and Defense Options

Key Takeaway: DUI manslaughter under Florida Statute §316.193(3)(c)3 occurs when a person drives under the influence of alcohol or drugs, and by reason of that operation, causes or contributes to causing the death of another person or an unborn child. It is a second-degree felony carrying up to 15 years in prison with a mandatory minimum of 4 years. If the driver also left the scene, the charge becomes a first-degree felony with up to 30 years. Under Trenton’s Law (effective October 1, 2025), a second DUI manslaughter conviction is now automatically a first-degree felony. These are the most serious DUI charges in Florida, and they demand an aggressive defense from the very first day.

I’m Tampa criminal defense attorney Rocky Brancato. With more than 25 years defending criminal cases in Hillsborough County, membership in the National College for DUI Defense (NCDD) and the DUI Defense Lawyers Association, an AV Preeminent rating from Martindale-Hubbell, and more than 150 jury trials to verdict, I bring the experience that DUI manslaughter charges demand.

How Does Florida Define DUI Manslaughter?

DUI manslaughter is defined under §316.193(3). The State must prove three elements beyond a reasonable doubt. First, the defendant violated §316.193(1) — meaning the defendant drove or was in actual physical control of a vehicle while impaired by alcohol, drugs, or a chemical substance, or had a blood-alcohol or breath-alcohol level of 0.08 or higher. Second, the defendant operated a vehicle. Third, by reason of that operation, the defendant caused or contributed to causing the death of a human being or an unborn child.

The phrase “caused or contributed to causing” is critical. The State does not need to prove that the defendant was the sole cause of the fatal crash. If the defendant’s impaired driving contributed to the death in any way — even if the victim was also at fault — the State can obtain a conviction. Because of this broad causation standard, DUI manslaughter cases are among the most aggressively prosecuted charges in Hillsborough County.

Florida Statute §316.193(3)(c)3: DUI manslaughter is a second-degree felony punishable by up to 15 years in prison, 15 years of probation, and a $10,000 fine. Every DUI manslaughter conviction carries a mandatory minimum of 4 years in prison — the judge cannot sentence below this floor regardless of mitigating circumstances. If the defendant also left the scene of the crash, the charge becomes a first-degree felony punishable by up to 30 years. Under Trenton’s Law (HB 687, effective October 1, 2025), a second conviction for DUI manslaughter is also a first-degree felony. At The Brancato Law Firm, P.A., we defend DUI manslaughter charges throughout the 13th Judicial Circuit.

What Are the Penalties for DUI Manslaughter?

The penalties depend on the specific circumstances of the crash and the defendant’s criminal history:

Warning — Trenton’s Law Changes (Effective October 1, 2025): Trenton’s Law (HB 687) — named after Trenton Stewart, an 18-year-old college student killed by a drunk driver in Jacksonville in 2023 — made two critical changes. First, a second conviction for DUI manslaughter, BUI manslaughter (§327.35(3)(c)3), vehicular homicide (§782.071), or vessel homicide (§782.072) is now a first-degree felony carrying up to 30 years in prison. Second, refusing a breath or urine test after a DUI arrest is now a separate criminal offense — a second-degree misdemeanor for a first refusal, a first-degree misdemeanor for a second. At The Brancato Law Firm, P.A., we stay current on every legislative change that affects how we defend these cases.

What Must the State Prove to Convict You of DUI Manslaughter?

The State must prove every element beyond a reasonable doubt. Each element presents a potential avenue for defense:

• Impairment or unlawful BAC. The State must prove the defendant was impaired by alcohol, drugs, or a chemical substance — or had a blood-alcohol or breath-alcohol level of 0.08 or higher. Without reliable chemical test results or compelling evidence of impairment through officer observations and field sobriety exercises, this element fails.
• Operation of a vehicle. The defendant must have been driving or in actual physical control of the vehicle at the time of the crash. In cases where the defendant was found outside the vehicle or where multiple people were in the car, the State must prove who was behind the wheel.
• Causation. The defendant’s operation of the vehicle must have caused or contributed to causing the death. This is often the most contested element. If the victim’s own conduct — such as running a red light, making an illegal turn, or driving impaired — was the sole cause of the crash, the defendant’s impairment did not cause the death.
• Death of a human being or unborn child. The State must prove the victim died as a result of injuries sustained in the crash, typically through medical examiner testimony and autopsy results.

How Do We Defend DUI Manslaughter Charges?

DUI manslaughter carries some of the heaviest penalties in Florida criminal law, but these cases are defensible. At The Brancato Law Firm, P.A., we attack the State’s case on every front:

• Challenge the DUI evidence. If the breath test result is unreliable — because the operator failed to follow calibration protocols, the machine malfunctioned, or the 20-minute observation period was not maintained — the court may exclude it. Similarly, field sobriety exercises conducted on an uneven surface, in poor lighting, or by an improperly trained officer may be discredited.
• Challenge causation with expert witnesses. Causation is frequently the strongest defense. An independent accident reconstruction expert analyzes speed, point of impact, road conditions, and visibility to determine whether the impairment actually contributed to the crash. In addition, an ASE-certified mechanic can inspect the vehicle for mechanical defects — failed brakes, tire blowouts, or steering malfunctions — that may have caused the crash independently of any impairment.
• Challenge the traffic stop. If law enforcement had no lawful basis to initiate the traffic stop, every piece of evidence obtained after the stop — including the breath test, blood draw, and officer observations — may be suppressed under the Fourth Amendment.
• Challenge the blood draw. In fatal crash cases, law enforcement frequently obtains a blood sample rather than a breath sample. The State must prove the blood was drawn by qualified personnel, stored properly, and tested using accepted methods. Any break in the chain of custody creates grounds for exclusion.
• Argue independent intervening cause. If the victim’s own negligent or reckless conduct was the sole cause of the crash, the defendant’s impairment did not cause the death. This defense requires thorough investigation of the victim’s actions, toxicology, and driving behavior.

What Is the Difference Between DUI Manslaughter and Vehicular Homicide?

Prosecutors frequently charge DUI manslaughter and vehicular homicide arising from the same fatal crash, but these are separate offenses with different elements. DUI manslaughter under §316.193(3) requires proof that the defendant was impaired or had an unlawful BAC. In contrast, vehicular homicide under §782.071 requires proof that the defendant operated a vehicle in a reckless manner likely to cause death or great bodily harm — but does not require proof of impairment.

Because of this distinction, the defense strategies differ significantly. A DUI manslaughter defense focuses on challenging the evidence of impairment and the chemical test results. A vehicular homicide defense focuses on whether the defendant’s driving conduct rose to the level of recklessness. When prosecutors file both charges, we build independent defenses for each count. Furthermore, if the State’s impairment evidence is weak but the driving conduct was arguably reckless, the defendant faces vehicular homicide exposure even if the DUI manslaughter charge fails.

What Should You Do If You Are Facing DUI Manslaughter Charges?

DUI manslaughter is a life-altering charge. If you or a family member faces this accusation, take these steps immediately:

1. Exercise your right to remain silent. In fatal crash investigations, law enforcement conducts extensive interviews — often at the hospital or at the scene while the defendant is in shock. Everything you say becomes evidence. Politely invoke your right to silence and request an attorney.
2. Contact a defense attorney before speaking with anyone. The State begins building its case within hours of a fatal crash. Crash investigators, blood draw technicians, and prosecutors all work quickly. An experienced attorney can intervene early — preserving evidence, protecting your rights, and identifying defense opportunities before they disappear.
3. Preserve all evidence. Dashcam footage, vehicle data recorders (black boxes), cell phone records, and witness contact information can all support the defense. Do not consent to a vehicle search beyond what law enforcement can lawfully obtain.
4. Understand the timeline. If you have been arrested and booked at Orient Road Jail or Falkenburg Road Jail, your first appearance before a Hillsborough County judge happens within 24 hours. Bond in DUI manslaughter cases is typically high, and the judge may impose conditions including GPS monitoring, alcohol testing, and license surrender. An attorney at first appearance can argue for reasonable conditions.

Frequently Asked Questions About DUI Manslaughter in Florida

What is the mandatory minimum sentence for DUI manslaughter?

Every DUI manslaughter conviction under §316.193(3)(c)3 carries a mandatory minimum of 4 years in prison. The judge cannot impose a lesser sentence regardless of mitigating factors. If the defendant also left the scene, the charge becomes a first-degree felony — and the mandatory minimum still applies. Tampa criminal defense attorney Rocky Brancato fights to avoid conviction entirely rather than negotiate around the mandatory minimum.

Can DUI manslaughter charges be reduced?

In some cases, yes. If the State’s evidence of impairment or causation is weak, prosecutors may negotiate a reduction to a lesser charge — such as DUI causing serious bodily injury (F3) or even reckless driving with serious bodily injury. However, prosecutors face intense public pressure in fatal DUI cases, which makes reductions less common than in standard DUI cases. The strength of the defense determines the State’s willingness to negotiate.

Trenton’s Law and Enhanced Penalties

How does Trenton’s Law affect DUI manslaughter cases?

Trenton’s Law (HB 687), effective October 1, 2025, added §316.193(3)(c)3.c, which makes a second conviction for DUI manslaughter a first-degree felony carrying up to 30 years in prison. The law also counts prior convictions for BUI manslaughter (§327.35(3)(c)3), vehicular homicide (§782.071), and vessel homicide (§782.072) as qualifying priors. In addition, Trenton’s Law makes refusing a breath or urine test a separate criminal offense. Because these changes are significant, anyone arrested for DUI after October 1, 2025 faces a fundamentally different legal landscape.

Is DUI manslaughter the same as murder?

No. DUI manslaughter does not require intent to kill. The State must only prove that the defendant drove while impaired and that the impaired driving caused or contributed to a death. However, in extreme cases — such as when the defendant has multiple prior DUI convictions — prosecutors have charged DUI-related deaths as second-degree murder under a “depraved mind” theory. At The Brancato Law Firm, P.A., we defend against all DUI-related homicide theories.

Hiring a Defense Attorney

Why do I need a specialized DUI defense attorney for a manslaughter charge?

DUI manslaughter sits at the intersection of DUI law, homicide law, and accident reconstruction science. The defense requires expertise in breathalyzer and blood test challenges, an understanding of crash dynamics, and the ability to retain and work with expert witnesses. Rocky Brancato holds membership in the NCDD and the DUI Defense Lawyers Association, has tried more than 150 jury cases, and has the resources to mount the comprehensive defense these charges require.

How much does it cost to defend a DUI manslaughter charge?

DUI manslaughter defense typically involves accident reconstruction experts, toxicology consultants, and extensive investigation — which means fees reflect the complexity of the case. The Brancato Law Firm, P.A. offers free, confidential consultations. Call (813) 727-7159 to discuss your case.

You Are Reading This for a Reason — Let Us Help

A DUI manslaughter charge carries a mandatory minimum of 4 years in prison, the possibility of up to 30 years if you left the scene or have a prior conviction, and a permanent felony record that follows you for life. However, these cases turn on the State’s ability to prove impairment and causation — and both elements are subject to aggressive challenge. Rocky Brancato has defended the most serious DUI charges in Hillsborough County for more than 25 years, and we know how to fight for the best possible outcome.

Every hour matters. The earlier Tampa criminal defense attorney Rocky Brancato gets involved, the more evidence we can preserve and the more options you have.

Call The Brancato Law Firm, P.A. today at (813) 727-7159 for a free, confidential consultation. We are available 24/7 and serve clients throughout Hillsborough, Pinellas, and Pasco Counties.

For more about how we defend DUI charges, visit our DUI Defense practice page. You may also find our guides on What Is DUI in Florida? and What Is Leaving the Scene of an Accident in Florida? helpful — these charges frequently arise together, and understanding the full picture is critical to an effective defense.

The Brancato Law Firm, P.A. is a Tampa-based criminal defense practice serving clients exclusively in Hillsborough, Pinellas, and Pasco Counties. We are not affiliated with any other Brancato-named law firms.

This page is for informational purposes only and does not constitute legal advice. Each case is unique, and outcomes depend on the individual facts and circumstances involved. Past results do not guarantee future outcomes.