The Florida rapper, a streaming juggernaut, won for his 2017 debut "17" and was also nominated for new artist of the year. Cleopatra Bernard, XXXTentacion's mother, accepted the award in his honor.
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"I am honored to accept this award on behalf of my son. I would like to thank the AMAs, his fans and to everyone who made this possible: thank you guys, so much," Bernard said. "I appreciate this."
XXXTentacion, born Jahseh Dwayne Onfroy, was killed June 18, 2018, in a robbery at a motorcycle dealership in Deerfield Beach, Florida. He was 20. Four suspects have been indicted in connection with the rapper's murder.
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XXXTentacion also won best new artist at the BET Hip Hop Awards earlier in October.
The Associated Press contributed to this report.