When a DUI involves a death or a serious injury, it stops being a misdemeanor and becomes a felony where prison is real and, in the worst cases, mandatory. These are the charges that change a life, and they are prosecuted hard and fast, with the State building its case in the hours after the crash. They are also defensible, and two threads run through every one of them: the forensic fight over the blood and the impairment, and the fight over causation, whether your operation of the vehicle is what caused the harm.
| Charge | What it is | Penalty |
|---|---|---|
| DUI manslaughter | Operating while impaired and, by that operation, causing or contributing to a death (s. 316.193(3)(c)3). | Second-degree felony, up to 15 years, four-year mandatory minimum, permanent license revocation. First-degree, up to 30 years, on leaving the scene or a qualifying prior. |
| DUI serious bodily injury | Operating while impaired and causing serious bodily injury as the statute defines it (s. 316.193(3)(c)2). | Third-degree felony, up to 5 years. |
| Vehicular homicide | Killing by operating a vehicle recklessly, likely to cause death or great bodily harm, with no impairment element (s. 782.071). | Second-degree felony, up to 15 years, and first-degree on a qualifying prior under Trenton’s Law. No mandatory minimum. |
| DUI as second-degree murder | A DUI death charged as depraved-mind murder, usually where a record of prior DUIs shows a disregard for human life. | First-degree felony, up to life. |
| Leaving the scene with death | Leaving a crash that results in a death without stopping and rendering aid (s. 316.027). | First-degree felony, up to 30 years, four-year mandatory minimum. |
| Leaving the scene with injury | Leaving a crash involving injury without stopping and rendering aid (s. 316.027). | Second- or third-degree felony, depending on the injury. |
| BUI manslaughter | The boating version: operating a vessel while impaired and causing a death (s. 327.35). | Second-degree felony with a four-year mandatory minimum, and first-degree on leaving or a qualifying prior. |
Trenton’s Law, effective October 1, 2025, raised several of these to first-degree felonies on a qualifying prior conviction. Lucy’s Law, effective July 1, 2025, added the four-year mandatory minimum to BUI manslaughter. Figures reflect sections 316.193(3), 316.027, 327.35, and 782.071, Florida Statutes. Figures last verified June 2026.
Causation runs through all of these
Across these charges, the State has to prove more than that you were impaired and that someone was hurt or killed. It has to prove that your operation of the vehicle caused or contributed to the harm, and for vehicular homicide it has to prove your operation was the proximate cause. Mere involvement in a crash is not enough. If the victim’s own conduct, a third party, or a mechanical failure was the sole cause, or if a sober driver would have had the same crash, the causal link the State needs may not be there. That is why these are accident-reconstruction cases as much as blood cases, and it is the single biggest lever for moving a charge down. The DUI manslaughter page walks through how that works.
The blood and the impairment are the other half
Fatal and serious-injury crashes almost always involve a blood draw, because the driver ends up at a hospital, so the State’s proof of impairment usually rests on a blood result. Every challenge I bring in a blood case lives here too: the probable cause for the draw, the chain of custody, the storage, and the gas chromatography analysis. As one of six ACS-CHAL Forensic Lawyer-Scientists in Florida, this is the ground I work, and an unreliable result can take the State’s number, and sometimes its whole case, off the table.
Trenton’s Law raised the ceiling
Florida’s 2025 changes under Trenton’s Law, effective October 1, 2025, hit this section hardest. A second DUI or BUI manslaughter, vehicular homicide, or vessel homicide is now a first-degree felony of up to thirty years, BUI manslaughter picked up a four-year mandatory minimum to match DUI manslaughter, and refusing a breath or urine test became a separate crime. The pages below reflect the current law.
The serious and felony DUI charges
I started out as an Assistant Public Defender in Florida’s Thirteenth Judicial Circuit, in Tampa, and today I am one of six ACS-CHAL Forensic Lawyer-Scientists in Florida. These are the cases where the science and the causation decide everything, where an unreliable blood result or an unproven causal link is the difference between a manslaughter conviction and a far lesser charge. I bring the forensic and the crash-reconstruction fight that these cases turn on. Learn more about my background.
The penalty levels for the non-injury felony tiers, a third DUI within ten years and a fourth, are covered in the DUI penalties section, and the evidence itself is in the blood test, breath test, field sobriety, drugged driving, and search and seizure sections. The boating version sits in the boating under the influence section.
Serious and felony DUI questions
When does a DUI become a felony in Florida?
A DUI is a felony when it causes serious bodily injury, which is a third-degree felony, or a death, which is DUI manslaughter and a second-degree felony, and also when it is a third DUI within ten years of a prior or a fourth at any time. A death can also be charged as vehicular homicide or, in rare cases, second-degree murder.
Is there a mandatory minimum for a DUI death?
Yes. DUI manslaughter and leaving the scene of a fatal crash each carry a four-year mandatory minimum, and BUI manslaughter carries one as well as of July 2025. Vehicular homicide does not carry a mandatory minimum, which is part of why it is a common reduction target.
Can a felony DUI charge be reduced?
Often, yes, and causation is usually the lever. If the State cannot prove your operation of the vehicle caused or contributed to the harm, or if the blood evidence is unreliable, a DUI manslaughter can move toward vehicular homicide or even a misdemeanor DUI.
What did Trenton's Law change?
Effective October 1, 2025, Trenton's Law made a second DUI or BUI manslaughter, vehicular homicide, or vessel homicide a first-degree felony of up to thirty years, and made refusing a breath or urine test a separate crime. The four-year mandatory minimum for BUI manslaughter came from a separate 2025 law, Lucy's Law, effective July 1.
Will I be held without bond on a DUI death case?
You can be. DUI manslaughter is among the offenses for which a court can order pretrial detention, so bond is not automatic in the most serious cases, which is why the first hearings and early counsel matter so much.
This page is general information about Florida law, not legal advice, and it does not create an attorney-client relationship. The charges discussed here are governed by sections 316.193(3), 316.027, 327.35, and 782.071, Florida Statutes, and the 2025 changes under Trenton’s Law apply to offenses on or after October 1, 2025. Every case turns on its own facts, and past results do not guarantee a similar outcome.
