The death of the up-and-coming rapper Lil Peep, whose real name was Gustav Ahr, on November 15, shocked the music world.

After a toxicology report had been performed by the Prima County Medical Examiner, the analysis came back revealing the death was caused by an overdose of Fentanyl and Xanax. Even though originally there was speculation that the singer committed suicide, the death was ruled accidental. Lil Peep had suffered from severe depression and was open about battling chronic depression, anxiety and suicidal thoughts. He had also had posted an instagram photo the day of his death with the caption,”When I die You’ll love me.”

The mixing of Fentanyl and Xanax can lead to many negative side effects, including death, respiratory system failure and coma. Lil Peep was also tested positive for traces of marijuana, cocaine, Tramadol and other prescription opiates in his system.

Lil Peep was discovered unresponsive by his manager by November 16. The rising star was in his tour bus, the day of a concert at a club in Tuscon, Arizona. At the scene, the authorities found drug paraphernalia and other evidence that led to the assumption of an overdose. Foul play was never suspected by authorities.

Many celebrities paid tribute to the late rapper online.  Lil Peep’s ex-girlfriend Bella Thorne took to Twitter in an emotional series of tweets, including “Peep you deserved more out of life. Life didn’t do your greatness justice.”

Another emotional tweet came from Riff Raff, noting that he had just recently seen his friend.