Long Island singer and rapper Lil Peep died late Wednesday at the age of 21, media reports said. The cause of death is yet to be confirmed but social media users claimed he died of a drug overdose.

Twitter users were shocked to learn about Lil Peep's death, which came just days after he celebrated his 21st birthday on Nov. 1. Rumors about the cause of death sparked after a photo posted on Lil Peep's account just hours before his death showed him with some tablets, which were reportedly Xanax, sticking out of his tongue.

“I’m completely heartbroken and lost right now,” Peep’s manager Mikey Cortez said on Instagram confirming his death. “I can’t even feel it’s not real. I love you and I’ll miss you always. One of the realest. Please someone tell me this isn’t real.”

His former lover Bella Thorne posted an emotional Instagram story as she mourned his sudden death.

"To anybody out there who is a Lil Peep fan you guys know how talented he was. How good he was," Bella said in a short series of videos. "Well, he was even more f------ great as a person."

Lil Peep, who is originally named Gustav Åhr, was due to perform at a show in Tucson, Arizona on Wednesday night as he toured to promote his first album, "Come Over When You're Sober."

DJ and producer Diplo said on social media: "Peep had so much more to do man he was constantly inspiring me. I don't feel good man."

Dutch dance music producer Marshmello also wrote: "Peep was the nicest person. Hanging out with him, talking to him about music, the song ideas we were going to do together and touring was so amazing. Everyone will miss you man."

Just 24 hours before his death, Lil Peep not only posted a photo of himself taking drugs but also discussed death in a message posted alongside his photo, saying “When I die You’ll love me.”

Lil Peep's social media accounts have given a glimpse into his lifestyle, with most of the posts displaying him drinking and dabbling in prescription drugs. The young star had spoken openly about addictions to cocaine, ecstasy and prescription tranquilizer Xanax.

"I am a depressed drug addict and I'm nearing my breaking point," he tweeted in February. "Everything I love is disappearing."

Social media users said Lil Peep's death from an alleged drug overdose should be a warning for those who take these pills.

"I never listened to Lil Peep but his death should be a wake up call to all kids this generation & the new “rappers” that think sippin’ lean & poppin’ pills is the new wave. It’s all fun & games until death is around the corner. Temporary feelings isn’t worth taking your life away," one user wrote.