The 20-year-old was gunned down as he left a South Florida motorcycle dealership.
He was found in his car with "no pulse".
The Florida rapper, born Jahseh Dwayne Onfroy, has more than 500,000 Twitter followers and 400 millions plays on SoundCloud.
He has also been feuding with Drake, claiming the Grammy-award winning artist has been ripping off his music.
In July last year, he was arrested and charged with robbery and assault with a deadly weapon.
He was awaiting trial for a string of domestic violence charges against his pregnant girlfriend.
In June 2017 the rapper was knocked out on stage - reportedly by a rival's thug pal - sparking a mass brawl.
Dramatic footage shows a man suddenly charge towards the musician mid-way through his performance and deliver a huge leaping punch which sends the star flying.