Two Alleged Tampa Fentanyl Dealers Are Charged With First-Degree Murder. How Can a Drug Sale Become Murder in Florida?

Two people accused of selling fentanyl in Hillsborough County are now facing one of the most serious charges available under Florida law:

First-degree murder.

The cases are unrelated. Neither defendant is accused of deliberately trying to kill the person who died.

Instead, the Hillsborough County Sheriff's Office says each defendant unlawfully distributed fentanyl that ultimately caused a fatal overdose.

That distinction raises a question that surprises many people:

How can selling drugs become first-degree murder when there was allegedly no intent to kill anyone?

Florida law specifically provides an answer.

Under certain circumstances, unlawfully distributing fentanyl or another specified controlled substance that causes someone's death can constitute first-degree murder.

But filing that charge and proving it are two very different things.

Two Separate Hillsborough County Fentanyl Cases

The Hillsborough County Sheriff's Office announced the murder charges on August 10, 2026.

The first case involves 39-year-old Robinson Stlouis.

According to HCSO, deputies found 34-year-old Kira Rogers dead inside a vehicle in a Tampa parking lot on October 17, 2025. Investigators say Rogers had met Stlouis the previous evening and obtained fentanyl from him.

Authorities later arrested Stlouis during a traffic stop on unrelated offenses and said they found him in possession of fentanyl.

Months later, toxicology results reportedly determined that Rogers died from fentanyl intoxication. HCSO says the concentration detected in her system was approximately eight times what investigators characterized as a lethal dose.

Stlouis was arrested August 7 and charged with first-degree murder resulting from the unlawful distribution of a controlled substance.

The second case involves 25-year-old Haley Williams.

Deputies responded to a Hillsborough County residence on December 30, 2025, where another woman had died from an apparent overdose.

According to investigators, 22-year-old Olivia Williams had obtained what she believed were oxycodone pills from Haley Williams. The two women shared a last name but were not related.

Forensic testing allegedly revealed something important:

The pills contained no oxycodone. Investigators say they were pressed fentanyl pills.

Toxicology testing reportedly attributed Olivia Williams' death to fentanyl toxicity, with a concentration approximately 14 times what investigators described as a lethal dose.

Haley Williams was arrested August 6 and charged with first-degree murder resulting from unlawful distribution of a controlled substance.

Both defendants are accused, not convicted, and the allegations will have to be established through the criminal court process.

Florida Doesn't Always Require an Intent to Kill for First-Degree Murder

When most people hear "first-degree murder," they think of premeditation.

Someone decides to kill another person, forms a plan and intentionally carries it out.

That is certainly one way first-degree murder can be committed in Florida.

It isn't the only one.

Section 782.04 of the Florida Statutes also addresses deaths resulting from the unlawful distribution of specified controlled substances.

The statute covers fentanyl and certain other drugs when an adult unlawfully distributes the substance and the substance is proven to be the proximate cause of the user's death.

If the statutory requirements are satisfied, the resulting homicide can constitute first-degree murder.

That means prosecutors don't necessarily have to prove:

"I sold this person fentanyl because I wanted that person to die."

The State's theory can instead be:

"You unlawfully distributed the qualifying drug, and that drug proximately caused the person's death."

That is a fundamentally different type of murder prosecution.

The Most Important Word May Be “Proximate”

It isn't enough for prosecutors to establish that a defendant sold drugs and the buyer later died.

The statute requires a causal connection.

Specifically, the controlled substance must be proven to have been the proximate cause of the user's death.

That can make toxicology and medical evidence central to the prosecution.

Suppose a person has several different substances in his or her system.

Which substance caused the death?

What if multiple drugs interacted?

What if the deceased had significant underlying medical conditions?

What if there is uncertainty about when different substances were consumed?

What if drugs came from multiple sources?

What if the substance allegedly supplied by the defendant cannot conclusively be connected to what was ultimately consumed?

Those aren't peripheral questions.

They can go directly to whether prosecutors can prove a murder charge.

Toxicology Evidence Will Likely Matter Enormously

HCSO emphasized the fentanyl concentrations found in both cases.

Investigators say Rogers had approximately eight times a lethal concentration and Olivia Williams approximately 14 times a lethal concentration.

Those numbers sound dramatic.

But in a criminal prosecution, a toxicology report doesn't simply speak for itself.

The State may rely on toxicologists, medical examiners and other experts to explain what was detected, what the concentrations mean and why they believe fentanyl caused the death.

The defense can scrutinize those conclusions.

That can include examining how specimens were collected and preserved, testing methodology, other substances detected, medical history, tolerance, postmortem changes and the scientific basis for conclusions concerning causation.

The ultimate question isn't whether fentanyl is dangerous.

Everyone can agree that fentanyl can be extraordinarily dangerous.

The legal question is much narrower:

Can the State prove beyond a reasonable doubt that the fentanyl allegedly distributed by this particular defendant was the proximate cause of this particular person's death?

Prosecutors Must Also Prove Who Supplied the Fatal Drug

There is another potentially critical step.

Before prosecutors can argue that a particular drug caused someone's death, they have to connect that drug to the defendant.

In many overdose investigations, nobody from law enforcement witnesses the transaction.

Investigators may instead reconstruct it afterward.

That can involve text messages, phone records, surveillance footage, financial transactions, witness statements, location information, social-media communications and drugs recovered during searches or later arrests.

The government may develop a powerful circumstantial case.

But each link still matters.

Suppose investigators can prove that the deceased communicated with a suspected dealer.

Can they prove a transaction actually occurred?

If a transaction occurred, can they prove what substance was transferred?

Can they prove the deceased consumed that substance?

Were other drugs obtained from someone else?

How much time passed?

Was any of the substance recovered?

These are the types of questions that can separate suspicion from proof beyond a reasonable doubt.

The Counterfeit Oxycodone Allegation Makes One Case Particularly Notable

The allegations involving Haley Williams highlight another increasingly important feature of fentanyl prosecutions.

According to HCSO, Olivia Williams believed she was receiving oxycodone.

Investigators say the pills actually contained fentanyl and no oxycodone.

Counterfeit pills present an obvious danger because someone may consume a substance without understanding what it actually contains.

From the prosecution's perspective, forensic testing identifying the pills as fentanyl may become important evidence.

But the criminal case will still require prosecutors to connect the tested pills, the alleged transaction and the fentanyl that caused the death.

The fact that a pill contains fentanyl doesn't by itself establish every element of a murder prosecution against a particular person.

What If the Dealer Didn't Know the Drugs Contained Fentanyl?

That raises another interesting question.

Suppose someone distributes pills believing them to contain one controlled substance when they actually contain fentanyl.

Does that automatically defeat a murder charge?

Not necessarily.

The precise answer depends on the statutory elements, the facts and the State's theory of prosecution.

But it illustrates why the defendant's knowledge and the exact nature of the alleged transaction can become significant issues.

Drug cases routinely involve disputes about knowledge.

Florida law generally does not treat merely being near contraband as identical to knowingly possessing or distributing it.

Likewise, prosecutors pursuing a homicide arising from drug distribution must prove the statutory elements applicable to that offense—not simply establish that something tragic occurred.

Drug Charges Can Escalate Far Beyond Possession or Trafficking

These Hillsborough County cases also illustrate how dramatically the consequences of an alleged drug transaction can change.

Someone initially investigated for possession, delivery or trafficking may eventually confront an entirely different level of criminal exposure if prosecutors contend the drugs caused a death.

Florida already imposes severe penalties for many fentanyl offenses.

Depending on the quantity and circumstances, an alleged fentanyl transaction can result in serious Florida drug trafficking charges.

Add a fatal overdose, and the same investigation can potentially become a homicide case.

That changes virtually everything about the defense.

The investigation may now involve medical examiners, toxicologists, homicide detectives, digital-forensics evidence and expert testimony concerning causation.

The potential punishment also increases dramatically.

First-Degree Murder Is a Capital Felony

Florida classifies first-degree murder under the applicable provisions of Section 782.04 as a capital felony.

That places these prosecutions in an entirely different category from an ordinary drug-delivery case.

The severity of the charge also explains why the distinction between an arrest and a conviction matters so much.

A sheriff's office can announce that investigators believe they have established the connection between a drug dealer and a fatal overdose.

That does not relieve prosecutors of their burden in court.

Every element still has to be proven through admissible evidence.

The defense still has the ability to challenge searches, statements, witnesses, forensic evidence and expert conclusions when a valid legal basis exists.

And unless a defendant enters a guilty plea, guilt ultimately has to be established beyond a reasonable doubt.

What Could a Defense Investigation Focus On?

Every case is different, but a defense attorney evaluating this type of prosecution would likely want to examine several distinct questions.

First is distribution.

What evidence actually proves the defendant supplied the drugs?

Second is identity.

Can investigators reliably establish that the substance allegedly transferred by the defendant was the substance ultimately consumed?

Third is causation.

What does the medical evidence actually establish about why the person died?

Fourth is other substances and other sources.

Did the deceased possess or consume additional drugs? Were there other potential suppliers?

Fifth is digital evidence.

Do text messages and phone records actually establish what prosecutors claim they establish, or are investigators interpreting ambiguous communications in the most incriminating way?

And finally, there are traditional constitutional issues.

How did police obtain the defendant's phone?

Was there a search warrant?

What did it authorize investigators to examine?

Were statements obtained lawfully?

Was physical evidence properly seized and preserved?

A first-degree murder label does not make those questions disappear.

It makes answering them more important.

An Overdose Does Not Automatically Equal Murder

This is probably the most important distinction for understanding Florida's law.

A person dying after using illegal drugs does not automatically transform every person associated with those drugs into a murderer.

Florida's statute contains specific requirements.

Prosecutors have to identify an unlawful distributor.

They have to prove distribution of a qualifying substance.

And critically, they have to prove the required causal relationship between that substance and the death.

The stronger the evidence connecting those steps, the stronger the prosecution becomes.

Weakness in any one of them can become important to the defense.

Why These Cases Matter Beyond Hillsborough County

Florida's fentanyl crisis has changed more than drug-enforcement priorities.

It has changed the potential consequences facing people accused of supplying drugs.

The traditional image of a drug prosecution involves possession, sale or trafficking.

A fatal overdose can now place homicide law at the center of the case.

That means someone who allegedly participated in what might otherwise have been prosecuted as a drug transaction can suddenly face the possibility of spending the rest of his or her life in prison.

The two Hillsborough County prosecutions announced this week demonstrate just how dramatic that transformation can be.

Neither Robinson Stlouis nor Haley Williams is alleged by HCSO to have intentionally set out to kill the person who died.

Yet both now face first-degree murder charges.

The Charge Is Only the Beginning

There is an understandable tendency to look at a fatal overdose, a toxicology result and an alleged drug dealer and assume the criminal case is straightforward.

Florida law makes that assumption dangerous.

The statute permits an extraordinarily serious prosecution.

It also requires prosecutors to prove the facts necessary to invoke it.

Who supplied the drugs?

What exactly was supplied?

What did the deceased consume?

Where did it come from?

What actually caused the death?

And can the State prove the necessary causal connection beyond a reasonable doubt?

Those questions may ultimately determine what happens in these two Hillsborough County cases.

Because under Florida law, a drug sale can indeed become first-degree murder.

But only if prosecutors can prove every step connecting the seller, the substance and the death.

J. Ruffin Hunt is a Florida criminal defense attorney and founder of Hunt Law | Tampa Criminal Defense. He previously served as a Division Chief with the Hillsborough County Public Defender's Office and represents individuals accused of misdemeanor and felony offenses throughout the Tampa Bay area.

This article is for general informational purposes only and does not constitute legal advice. Robinson Stlouis and Haley Williams are accused, not convicted, and are presumed innocent unless and until proven guilty. The factual discussion above is based on publicly reported allegations from law enforcement and news reports.