Ohio’s highest court has put a Grove City woman back on the path to prison, reinstating her involuntary manslaughter and corrupting-another-with-drugs convictions tied to a 2019 heroin run that ended in a friend’s fatal overdose.
In an April 9 ruling, the Ohio Supreme Court revived the case against Carol Seymour, who drove her friend, Robby J. Alsey, to buy heroin in 2019. His use of that purchase was followed by a deadly overdose. The decision steers Seymour back toward the four-year prison term a trial judge handed down after a bench trial and tightens the legal standard for causation in mixed-drug overdose cases that have been puzzling courts across the state.
How the case reached the state’s top court
In October 2024, the Tenth District Court of Appeals threw out two of Seymour’s convictions, ruling that prosecutors had not proven the heroin she helped obtain directly caused Alsey’s death. In its written decision, the Tenth District Court of Appeals noted that experts could not single out one drug as the primary cause of death in a body that had multiple substances on board.
Franklin County prosecutors were not content to leave it there. They asked the Ohio Supreme Court to review the case after the reversal, pressing the justices to clarify how causation should work when several drugs might have contributed to an overdose. The Franklin County Prosecutor’s Office had originally indicted Seymour following Alsey’s 2019 death.
What the Ohio Supreme Court said
In a unanimous opinion issued April 9, 2026, the Supreme Court rejected the appellate court’s narrow view of causation and reinstated Seymour’s convictions. The justices said the state does not have to show that a defendant’s conduct was the sole cause of death.
Instead, the court wrote that “the State need only prove that the death or serious physical harm would not have occurred absent the defendant’s conduct,” and it confirmed that circumstantial evidence, including toxicology results and cellphone records, can meet that standard. The decision, detailed in the opinion posted on Justia, spells out the test and overturns the Tenth District’s earlier call.
Evidence relied on at trial
Trial records show that on January 10, 2019, Seymour picked up Alsey and drove him to a house where another individual handed her a packet of heroin, according to testimony. She later received antifreeze as payment for the favor, an odd form of compensation that nonetheless became part of the trial record.
Tenth District Court of Appeals documents and toxicology reports admitted at trial identified heroin, diphenhydramine (Benadryl), methylphenidate (Ritalin) and mitragynine (kratom) in Alsey’s system. The coroner testified that the drugs likely acted together to cause the fatal overdose. After finding Seymour guilty, the trial judge merged the involuntary manslaughter and corrupting-with-drugs counts and imposed a four-year sentence, with a concurrent 10-month term for heroin trafficking.
Why the ruling matters
The Supreme Court’s clarification may give prosecutors an easier path in overdose-related manslaughter cases where several substances show up in toxicology screens. Under the high court’s reading, the presence of other contributing drugs does not automatically defeat a “but-for” causation finding if the state can still show the death would not have happened without the defendant’s conduct.
Court News Ohio previewed the oral arguments and highlighted that the case exposed a split among lower courts over how strict the causation requirement should be in overdose cases. Defense attorneys, looking at the new standard, say the ruling is likely to spark fresh battles over how broadly it can be stretched in complex toxicology situations.
What comes next
By reversing the appeals court and reinstating the trial judge’s decision, the Supreme Court effectively restored Seymour’s four-year sentence from her bench trial. Franklin County prosecutors had specifically asked the justices to iron out conflicting appellate approaches to causation, a request the court ultimately granted in the state’s favor.
The opinion on Justia, along with the appellate record, now serves as a roadmap for how Ohio courts are expected to evaluate similar overdose prosecutions going forward.
