Police in Tucson, Arizona have reportedly received tips about the role of possibly fentanyl-laced drugs in the death of Lil Peep. Tucson law enforcement sources said Monday that investigators are "on the hunt" after receiving multiple tips, TMZ reported

Peep's brother Karl Åhr, who goes by Oskar, revealed to People earlier this month that the family received word that laced pills may have contributed to his death. "We [the family] have heard there was some sort of substance he did not expect to be involved in the substance he was taking," said Oskar, contending that the death was an accident. "He thought he could take what he did, but he had been given something and he didn't realize what it was."

Lil Peep’s cause of death was deemed a drug overdose by the local medical examiner’s office; official toxicology results typically take six to eight weeks to receive.

As noted in a 2016 Vice profile on the opioid medication, many fentanyl overdose victims have no idea what they're ingesting. Dealers are known to lace substances with fentanyl because it's "cheap and available." Synthesizing fentanyl, which can potentially be 100 times stronger than morphine, only requires over-the-counter ingredients.

Prince died of an accidental fentanyl overdose in 2016.

Peep was found unresponsive on his tour bus in Tucson on Nov. 15, days away from wrapping his Come Over When You're Sober Tour. The tour took its name from Peep's debut studio album, which was released through Warner Music Sweden and First Access Entertainment in August. The seven-track project continued Peep's influential melding of emo melodies and Future-esque moods, this time ditching the rock-oriented samples of his Hellboy and Crybaby mixtapes in favor of collaborations with Rob Cavallo (My Chemical Romance, Green Day) and The Mars Volta's Juan Alderete.

Rest in Peep.