The 20-year-old was shopping for a motorcycle when a gunman ran up to his vehicle and shot him. Witnesses told the outlet they heard multiple shots.
Videos of what appeared to be Onfroy unresponsive in the driver seat of a auto circulated on social media Monday.
Rap star XXXTENTACION has been killed following a shooting in Miami, Fla. on Monday.
The rapper was punched by someone who rushed the stage, according to the station.
"Real name Jahseh Onfroy, he only released a debut album, "17", in August, and followed up with "?" in March.
The Broward County Sheriff's Twitter account released a statement asking for information on the suspects, who are described as armed and driving a dark-colored SUV.
Furthermore, his second album, ?, managed to debut at No. 1 on the charts back in March.
He has had numerous arrests in South Florida, beginning when he was a juvenile and he is now awaiting trial for a domestic violence incident involving his pregnant girlfriend. His house arrest had been imposed as he awaited trial for a variety of charges stemming from his alleged violent abuse of an ex-girlfriend.
He was released from jail on house arrest late last year and was released from house arrest earlier this year to allow him to tour. Reports say his run-ins with law enforcement also included two robberies, assault with a deadly weapon and witness tampering. His previous album, "17", reached No. 2 a year ago.
"Tomorrow's not promised ... you could be here today and be gone tomorrow", he said.