His real name was Jahseh Onfroy.
The Broward County Sheriff’s department later confirmed his death.
Authorities say two men fled the scene in a dark SUV after one had opened fire in what investigators say may have been a robbery.
His second album, titled only as a question mark, debuted at at the top of the Billboard charts in March.
Media reports say Onfroy had spent time in jail and youth detention centers and he was awaiting trial for domestic violence against his pregnant girlfriend.
His death brought tributes from across hip-hop, including from Kanye West.
West tweeted, “I never told you how much you inspired me when you were here.”