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Jahseh Dwayne Ricardo Onfroy (January 23, 1998 – June 18, 2018), known professionally as XXXTentacion (often stylized as XXXTENTACION) and commonly referred to as simply X, was an American rapper, singer, and songwriter. Though a controversial figure due to his widely publicized legal troubles, XXXTentacion gained a cult following among his young fanbase during his short career with his depression and alienation-themed music. Critics and fans often credit him for his musical versatility, with his music exploring emo, trap, lo-fi, indie rock, nu metal, hip hop, R&B, and punk rock. He is considered as a leading figure in the emo-rap and SoundCloud rap genres which garnered mainstream attention during the mid-late 2010s.

Born in Plantation, Florida, XXXTentacion spent most of his childhood in Lauderhill. He began writing music after being released from a juvenile detention center and soon started his music career on SoundCloud in 2013, employing styles and techniques that were unconventional in rap music such as distortion and heavy guitar-backed instrumentals, drawing inspiration from third-wave emo and grunge. In 2014, he formed the underground collective Members Only and alongside other members of the collective soon became a popular figure in SoundCloud rap, a trap music scene that takes elements of lo-fi music and harsh 808s.

XXXTentacion gained mainstream attention with the single "Look at Me". His debut album 17 (2017) is certified double-platinum in the US and reached number two on the Billboard 200. His second album ? (2018) debuted at number one on the Billboard 200 and is certified triple-platinum in the US. Its lead single, "Sad!", reached number one on the Billboard Hot 100, and had amassed more than a billion views on YouTube and 1.6 billion streams on Spotify by July 2021, as well as being certified Diamond by August 2021. He is also the best-selling emo rapper of all time.

On June 18, 2018, XXXTentacion was murdered at the age of 20 when he was fatally shot near a motorcycle dealership in Deerfield Beach, Florida. The attackers fled the scene in an SUV after stealing a Louis Vuitton bag containing $50,000 from him; four suspects were arrested. No trial date has been set for the accused and the motive for the murder remains under investigation.

XXXTentacion has RIAA-certified sales of 61 million units in the US and BPI-certified sales of over 7 million units in the UK, bringing his total to 68 million certified records sold in the two countries. Since his death, he has won an American Music Award and a BET Hip Hop Award and received 11 Billboard Music Award nominations. Two posthumous albums were released, Skins (2018) and Bad Vibes Forever (2019); the former became his second number-one album on the Billboard 200 while the latter entered the top 5.