In the early hours on the morning of June 8, 2017, employees at a Weis Markets supermarket in Eaton Township, Pennsylvania, United States, were stocking and closing the store for the night.

Prior to carrying out his rampage, he kept detailed video recordings and journals leading up to the shooting, most of which he uploaded to online forums and social media profiles.

In these writings and videos, he expressed his willingness to commit suicide, addressed the personal tragedies and other misfortunes he experienced which led him to a state of depression, a fear of aging past his 20s, described cross-dressing and questioning his gender identity, provided detailed explanations of his plans for carrying out the shooting, and explained his belief that these murders would allow him to cross over to an animated world he had imagined.

It then featured a crudely animated sequence depicting him and one of the characters from EGS murdering students at a fictional high school, before ending with montages of previous videos explaining the motives behind the shooting.

He then pulled out two pistol grip pump-action shotguns that he had concealed in a duffel bag[13] and walked around the store and killed three employees—Victoria Brong, Brian Hayes, and Terry Lee Sterling.

He then approached another coworker, Kristan Newell, who had not heard the shooting due to her listening to music with headphones on while she was labeling items and stocking shelves near the rear of the store.

[15] After this, Stair proceeded to fire at a glass and other merchandise in the store and shot multiple small portable propane tanks, which failed to explode.

Whilst Newell was on the phone to the police, Stair placed the loaded shotgun in his mouth and fired a single round through his palate, killing himself instantly.

[citation needed] The shooting did not receive much attention outside of local news outlets, but multiple Pennsylvania public leaders expressed their sadness and condemned the shooter's actions.