XXXTentacion was honoured at the American Music Awards (AMAs), winning a posthumous gong.
The rapper, who was gunned down in Florida in June aged 20, was recognised for his album 17.
It won favourite record in the soul/R&B category, seeing off competition from Khalid and SZA.
XXXTentacion’s mother, Cleopatra, accepted the prize on stage.
Fighting back tears, she said: “I am honoured. On behalf of my son, I would like to thank the AMAs, his fans and everyone who made this possible. Thanks guys, I appreciate it.”
XXXTentacion, whose real name was Jahseh Onfroy, was fatally shot as he left a motorcycle dealership in South Florida in June.
Officials said a struggle ensued when the rapper’s sports car was blocked by another vehicle, two masked gunmen approached and shot XXXTentacion multiple times.
The gunmen fled with a Louis Vuitton bag containing 50,000 US dollars (£37,900). Four men are accused of his death.
XXXTentacion is one of three high-profile rappers to die this year, alongside Lil Peep and Mac Miller.