However, in the wake of his death a series of private messages between Lil Peep and a 20-year-old fan called Mariah Bons emerged after Ms Bons allegedly boasted about getting him "high af" during a visit to their tour bus hours before he died.
The messages, which have been circulating on social media for more than a week, were published by TMZ on Wednesday after police launched a criminal investigation into the rapper's "suspicious" death after reviewing "new evidence".
One of the messages purportedly from Ms Bons reads: "GBC [Lil Peep] high af because of me and my friend lol."
Another says: "He passed the f**k out my brother called and I tried to get him to say hi to my brother but he wouldn't wake up."
Ms Bons's brother Nicky Bons was the subject of Lil Peep's last tweet, which called for his release from jail, where he is serving time for assault.
Posted at 3.01pm on November 15, the day of his death, the tweet reads: "Free my biggest fan Nick Bons I love u".
Outraged fans started circulating the messages on social media last week, leading to further allegations that she supplied Lil Peep with Xanax laced with the powerful opioid Fentanyl without the star's knowledge.
Fans have also started an online petition to get Ms Bons arrested which has so far garnered almost 30,000 signatures.
The Tucson Police Department this week launched a criminal investigation into the text messages and are now treating Lil Peep's death as "suspicious".
Overnight, Sergeant Pete Dugan told Rolling Stone that detectives are currently "looking into the allegations that somebody was linked to his death".
He said much of the investigation hinged on "what was in his system", but stressed it would be another six to eight weeks before the toxicology results came back.
An earlier police report, obtained by TMZ, stated that Lil Peep dozed off around 5:45pm ahead of the show.
His manager reportedly went to check on him and saw that he was breathing normally. Unable to wake him, she decided to let him sleep longer.
Lil Peep's best friend, British emo rapper Bexey Swan, made a Snapchat video of his passed out friend, earning criticism from heartbroken fans who accused him of failing to help his friend and effectively filming his death.
At least one Instagram user copied the Snapchat footage and shared it on their account, to the anger and disgust of Lil Peep's fans, who incorrectly linked the video to his death.
"Ur a f**king sociopath holy s**t," one wrote.
"If you think it's all right for someone to post the video of his death you're seriously f**ked up," another commented.
Others accused Bexey of "laughing" at his friend's "dead body".
But the heartbroken Bexey lashed back saying he had no idea Lil Peep was dying at the time. He posted a song he wrote for the star to SoundCloud on November 21 in which he explained the video.
It includes the lines: "Tryna stay strong for the loners thats like us/made a video of you sleeping in the back of the bus/ I made a joke and said that Gus is working out finally/ Then put the camera on you to see that you was falling asleep/ everyday of the tour, like you usually do/ head back, mouth open, yep the usual/ I saw you like this every day on the entire tour/ I didn't know that you was a dead man/ As if I woulda recorded."
He also told fans in an emotional Instagram video: "My brother just died in my arms, man. I'm done with this s**t now forever. F**k this s**t".
In his last interview, recorded two days before his death with New Zealand-born, LA-based DJ and music producer Zane Lowe, the rapper confessed his anxiety was "getting worse and worse".
A slew of big names, including Diplo, Travis Barker, Pete Wentz, Riff Raff, Marshmello and Lil Peep's ex-girlfriend actor Bella Thorne have paid tribute to the star since his shock death.
The son of Harvard-educated parents, Lil Peep moved to LA to pursue his music career at age 17 and quickly built up a devoted fan base.
His best known song was Star Shopping, which references drug use and depression.
"I am a depressed drug addict and I'm nearing my breaking point," he tweeted in February. "Everything I love is disappearing."
On the day of his death, he wrote on Instagram: "When I die You'll love me."
Sarah Stennett of First Access Entertainment, a company which had been working with Peep, issued a statement after his death saying she was "shocked and heartbroken" and did "not believe Peep wanted to die".
"He had big goals and dreams for the future which he had shared with me, his team, his family and his friends," she said.
"He was highly intelligent, hugely creative, massively charismatic, gentle and charming. He had huge ambition and his career was flourishing."
