Lil Loaded, the Dallas rapper behind the 2019 viral summer hit “6locc 6a6y,” has died at age 20.

The Dallas County medical examiner’s office confirmed Monday to USA TODAY that the young rapper, whose legal name was Dashawn Robertson, had died. Officials did not reveal the cause of his death.

Ashkan Mehryari, an attorney for the rapper, Robertson, confirmed the death to hip hop magazine XXL and The Dallas Morning News. Mehryari told the Dallas publication that his client’s death was “very tragic” and unexpected.

“He had a very bright and promising music career ahead of him,” Mehryari said.

Lil Loaded’s death comes a week after “6locc 6a6y” was certified gold on May 25 by the Recording Industry Association of America. “6LOCC 6A6Y Certified Gold 🏆🏆 Who runnin dis (expletive) like me 💙💙 … dopest fanbase on earth,” Lil Loaded wrote on Instagram at the time.

The music video for the song has amassed nearly 29 million views on YouTube. The rapper’s follow-up single in October 2019, “Gang Unit,” became an even bigger hit with over 39 million YouTube views.