A 44-year-old Jacksonville man is facing a manslaughter charge after detectives say a nine-month investigation traced a fatal drug overdose back to him. Sean Coss was arrested following a search warrant executed at his home in the Deerwood area on August 20, with police also filing several drug possession charges against him.
According to the Jacksonville Sheriff's Office, the case began in November 2025 after a 61-year-old man died of an overdose. The department's Overdose Investigations Unit spent the following nine months building the case before detectives named Coss as the suspect and arrested him for manslaughter in connection with the man's death.
When detectives searched Coss's home in Deerwood, an established gated country club community on Jacksonville's Southside known for its guarded entrances and custom homes, they reported finding a substantial stash of narcotics and cash. The search turned up 875.3 grams of marijuana, 28.8 grams of powder cocaine, 19.3 grams of crack cocaine, four handguns, and $1,565 in cash, per the sheriff's office. Coss is now awaiting trial in the Duval County jail.
How JSO Builds These Cases
The manslaughter charge against Coss did not come from a routine drug bust — it came from a specialized unit inside the Jacksonville Sheriff's Office built specifically to chase these cases. As News4JAX reports, the Overdose Investigations Unit is made up of 14 detectives and supervisors who investigate every fatal overdose in the city as a potential homicide, working backward from a death scene to try to identify the supplier. That approach relies on a Florida law, cited by attorney Richard Hornsby, that lets prosecutors bring murder or manslaughter charges against a distributor whose drugs proximately cause a fatal overdose — without having to prove the dealer intended to kill anyone.
The unit has been busy this year. As of late July, it had investigated 164 overdose deaths in 2026 and arrested 43 suspects tied to those cases, according to a JSO Facebook post. Just weeks before Coss's arrest, the same unit executed a separate search warrant on Jacksonville's Westside, seizing more than 849 grams of fentanyl — an amount estimated at over 400,000 lethal doses — and arresting a 41-year-old suspect, a case Hoodline covered in its Westside fentanyl raid report.
A Broader Enforcement Push
Jacksonville officials have pointed to these prosecutions as part of a larger enforcement trend. In December 2025, Sheriff T.K. Waters announced that 17 drug dealers were facing manslaughter charges across Duval County tied to fatal overdose investigations, according to a JSO Facebook post reported by Jacksonville Today. That same year, the sheriff's office said detectives seized 28 kilograms of fentanyl valued at $638,000, 60 kilograms of powder cocaine worth $1.1 million, and 177 firearms citywide.
Overdose investigations themselves have been trending downward even as arrests continue. Jacksonville Today reported that overdose death investigations by the sheriff's office dropped 33% from 472 cases in 2022 to 317 in 2024, then fell further to 237 cases in 2025 — a decline Waters attributed to the targeted enforcement carried out by the Overdose Investigations Unit. That local trend lines up with a statewide pattern: an interim report from the Florida Medical Examiners Commission, released by the Florida Department of Law Enforcement, found total drug-related deaths across the state fell 19% in the first half of 2025 compared with the prior year, with opioid deaths down 42% and fentanyl deaths down 46%.
Legal Exposure for Dealers, Protection for Bystanders
The statute prosecutors are using against Coss, Florida Statute § 782.04(1)(a)3, treats unlawful distribution of Schedule I substances, cocaine, or synthetic opioids that proximately causes a fatal overdose as a homicide-level offense, according to attorney Richard Hornsby. Separately, Florida's 911 Good Samaritan law, codified at Florida Statute § 893.21, offers limited immunity from arrest and prosecution for minor drug possession to people who seek emergency help in good faith for an overdose victim, per Andrew Pickett Law. That protection applies only to personal possession and paraphernalia offenses and does not shield commercial distributors like the one JSO alleges Coss to be.
The sheriff's office says it intends to keep pursuing these prosecutions, warning that dealers whose drugs lead to a death in the community will be held accountable and that sales in Jacksonville will be stopped. Questions remain unresolved in Coss's case, including the specific toxicology findings behind the November 2025 death — whether fentanyl or multi-drug toxicity was involved — and the formal court schedule as prosecutors continue reviewing the charges. Anyone with information relevant to community drug activity is asked to contact the Jacksonville Sheriff's Office at 904-630-0500.
