Rapper Lil Peep died Wednesday night of a suspected drug overdose, according to police in Tucson, Arizona, the Associated Press reports. Sgt. Pete Dugan told the Associated Press that evidence points to an overdose of Xanax, although no official cause of death has been announced. The rapper (real name: Gustav Ahr) was found dead on his tour bus before a scheduled concert in the city.

Sgt. Dugan’s comments were based on a report from the Pima County medical examiner’s office, although the report noted that it will take six to eight weeks to complete the toxicology report and make a final determination of the cause of death.

The rapper published a series of disturbing Instagram posts in the hours and days before his death, including one with a photograph of him with pills on his tongue, another saying “When I die you’ll love me,” and another that reads: “I just wana be everybody’s everything I want too much from people but then I don’t want anything from them at the same time u feel me I don’t let people help me but I need help but not when I have my pills but that’s temporary one day maybe I won’t die young and I’ll be happy? What is happy I always have happiness for like 10 seconds and then it’s gone. I’m getting so tired of this.”

Social media was filled Thursday with artists and fans paying tribute to Lil Peep, who was 21 at the time of his death.