Expelled student arrested over a mass-shooting threat on the UIUC subreddit

In early May 2023, a post appeared on the 'UIUC' subreddit — the community for the University of Illinois Urbana-Champaign — stating that the author planned to 'shoot up the school.' An alarmed Reddit user who saw the post alerted University of Illinois police, setting in motion an investigation that crossed state lines within roughly a day.

UIUC police traced the post to Pasco County, Florida. There, the Pasco County Sheriff's Office located and arrested Jonathan A. Zheng, a 22-year-old resident of Wesley Chapel, Florida, at his home on 2 May 2023. Zheng had been a University of Illinois student but, according to news accounts, had been expelled in November 2022. Reporting indicated that he admitted to having written the post.

Zheng was arrested and charged under Florida law with offences relating to written threats to kill or conduct a mass shooting. Coverage at the time noted that potential federal charges were also being explored, given the interstate nature of the threat and the platform involved. The publicly reported record establishes the arrest, the charges, and the reported admission; it does not, in the sources reviewed, establish a final disposition such as a conviction, plea, or dismissal. This case should therefore be understood as one of charges and a reported admission rather than an adjudicated conviction.

The episode is a clear example of the protective side of Reddit's user base. Rather than a witch-hunt or misidentification, this was a case in which an ordinary community member recognised a credible-sounding threat to a specific campus and reported it to authorities, who were then able to use the digital trail to identify and locate the poster quickly despite the geographic distance between the threatened campus in Illinois and the poster's home in Florida.

It also illustrates how subreddit communities tied to specific real-world institutions — universities, cities, workplaces — can become both targets of and early-warning systems for threats. The speed of the response, from post to cross-state arrest in about a day, reflects the cooperation between platform users, campus police, and local law enforcement. For an archive of Reddit-connected events, the case sits alongside other instances in which posts on Reddit served as the originating act and the locating evidence, while underscoring the importance of distinguishing an arrest and charge from a proven conviction.