The 22-year-old daughter of Slipknot percussionist Shawn Crahan died from "an apparent overdose", according to multiple media outlets.
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TMZ reports that law enforcement sources found "drug paraphernalia and evidence of narcotic use" at the scene of Gabrielle Crahan's death in Hollywood on Saturday night (local time).
The celebrity gossip website adds that CPR was administered by paramedics, to no avail.
Metal legend Shawn, also known as Clown, announced his daughter's death in an emotional post on social media, written from "a place of the deepest pain".
Gabrielle had herself posted on Instagram just three days before her death, celebrating five months of sobriety with a photo of an Alcoholics Anonymous coin.
Shawn thanked fans for the "endless amount of love, prayers thoughts and kindness" he and his family had been receiving in the wake of the tragic news.
"You have all proven that there is empathy, positivity and strength in this community that we call humanity here on Earth."
Gabrielle's funeral will be held this weekend in Iowa.