At the time of his death, the rapper was awaiting trial after pleading not guilty to domestic abuse against his former girlfriend, Geneva Ayala.
Two men fled the scene in a dark SUV after one of them opened fire during a possible robbery attempt, investigators had said.
According to the arrest report, contact was made with Williams as he drove a 2004 silver Honda Accord by himself.
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XXL has reached out to the Broward Sheriff's Office for comment.
CCTV footage reportedly studied by detectives showed two men, one in orange sandals, following the rapper into the dealership, where they bought a red mask, Yahoo News reports. Later, he faced more charges including witness tampering. He was then shot multiple times, the suspects removed a small bag from XXX's auto and then fled the scene.
More details of the arrest will be released later, she said.
In interview with XXL magazine, which named him an up-and-coming artist past year, the rapper cited Nirvana, the Notorious B.I.G. and Tupac Shakur among his musical influences.
XXXTentacion had a top-selling album in March and had a top-10 hit called "Sad!".
If the video is authentic, you have to wonder if it helped lead authorities to apprehend Williams, who he faces possible life in prison if convicted of killing XXXTentacion. His mother would buy him clothes, phones and other gifts.