YouTuber's online friend recalls graphic video threatening her before supermarket shooting

This story discusses suicide. If you or someone you know is having thoughts of suicide, please contact the Suicide & Crisis Lifeline at 988 or 1-800-273-TALK (8255).

A video uploaded by YouTuber Randy Stair in 2016 prompted one of his online friends to cut off contact. Less than a year later, Stair carried out a workplace shooting at a Pennsylvania supermarket, trapping and killing three co-workers before taking his own life.

"It was scary," Sammy told Fox News Digital. "I don't want to say it was almost like a betrayal...