He was reportedly taken to the hospital following an overdose.
If I had to bet on one Peep song to posthumously become a chart-certified hit, it's "Awful Things", the single most potent example of Peep as a rock singer.
Tour staff said Lil Peep - real name Gustav Ahr - had failed to appear for a sound check ahead of a gig, and was found unconscious at about 9pm.
Rest in peace Lil Peep, you will be missed. "Life didn't do your greatness justice".
Wrote one fan as news of his death broke: "Lil peep challenged the stigma around mental health, lgbt issues, gender roles, addiction... let's please make this about celebrating the fantastic things he's done in his short life instead of writing him off as another pill popping rapper".
EDM composer Diplo wrote on Twitter that Åhr "had so much more to do man he was constantly inspiring me", and fellow producer Marshmello said "We were just talking last week about working on a song together and now you're gone".
According to Dugan, Lil Peep's manager found him unresponsive on his tour bus around 8:30 to 8:45 p.m. on Wednesday, November 15, ahead of a scheduled concert in Tucson, Arizona.