Greg Polhaus at his home workstation in Dayton, Ohio, on Thursday, as federal agents conducted a preliminary interview in the adjoining hallway. Credit: James Ketcham/The Dayton Daily News
Greg Polhaus at his home workstation in Dayton, Ohio, on Thursday, as federal agents conducted a preliminary interview in the adjoining hallway. Credit: James Ketcham/The Dayton Daily News

DAYTON, Ohio — A 34-year-old software engineer from suburban Dayton has drawn the attention of federal law enforcement and the broader scientific community after reportedly developing the ability to identify anonymous internet commenters and cause their heads to detonate remotely, according to officials briefed on the matter.

The man, identified as Greg Polhaus, first noticed the ability in late February while reading a Reddit thread about sourdough bread. “Someone called me a moron for using bread flour instead of all-purpose,” Mr. Polhaus told investigators, according to a transcript reviewed by this publication. “I got this feeling, like a warm tingling behind my eyes, and then I just knew where he lived. And then, you know.” The commenter, a 28-year-old in Scottsdale, Arizona, was pronounced dead at the scene, his head having apparently burst in what the Maricopa County coroner’s office described as “a rapid and total cranial dispersal event.”

Since then, at least fourteen anonymous internet users across six states have suffered identical fates, all of them linked to hostile or inflammatory posts directed at Mr. Polhaus on platforms including Reddit, X, YouTube, and a surprisingly contentious Nextdoor thread about leaf blower etiquette. Dr. Helen Vanderbrook, a neurologist at the Cleveland Clinic who has examined Mr. Polhaus, said the phenomenon defies current medical understanding. “His MRI shows entirely normal brain structure,” Dr. Vanderbrook said. “There is no precedent for this in the literature. We are, frankly, at a loss.”

The Federal Bureau of Investigation confirmed it has opened an inquiry but acknowledged jurisdictional uncertainty. “We are not sure whether this falls under cybercrime, domestic terrorism, or something else entirely,” said Special Agent Marcus Dewitt, speaking on background. “There is no statute that specifically addresses psychic head explosion. We are consulting with legal.” The American Civil Liberties Union has urged caution, noting that any prosecution could raise novel First Amendment concerns. “The trolls were exercising their right to free speech,” said staff attorney Danielle Osei. “The fact that doing so caused their heads to explode does not, in our view, diminish the constitutional question.”

Mr. Polhaus, who remains free and has not been charged, told reporters outside his home that he has no desire to harm anyone and has largely stopped reading comments online. “I’ve deleted most of my accounts,” he said. “I’m just trying to be responsible about this.” He added that he had taken up woodworking. Neighbors describe him as quiet and considerate, though several noted they had recently stopped posting on social media altogether.