Authorities in South Florida continue to put together a case against the men believed to be involved XXXTentacion's killing.

Robert Allen, the third man arrested in connection with the June murder of XXX, has been denied bail by a South Florida judge, according to ABC Local 10. Allen will remain behind bars while he waits to face charges of first-degree murder, robbery and drug possession.

As previously reported, Allen, 22, was named as a person of interest in the killing in early July, but eluded capture until last week. He was arrested on Wednesday (July 25), by the Marshals Fugitive Task Force who located him at his sister's house in Eastman, Ga. after receiving a tip. The suspect was held in Dodge County until he was extradited to Broward County, Fla. on Thursday (July 27).

A grand jury has indicted four men who are believed to be involved in the rapper's death; Allen, Michael Boatwright (22), Trayvon Newsome (20) and Dedrick Williams (22). Williams was the first to be apprehended and has been charged with first-degree murder. Boatwright was arrested on July 5 on unrelated drug charges and served with a warrant for murder a few days later.

Police believe all four men plotted to rob XXX, executing their plan after seeing the rapper with a large amount of cash shopping for motorcycles at Riva Motorsports in Deerfield Beach, Fla. on the day of the murder. The men are believed to have ambushed the rapper while he was exiting in his car. The Broward Sheriff's Office think Newsome and Boatwright jumped out of the car to rob the rapper, while Williams served as the driver. After a brief struggle, X was shot and the four men fled the scene in a dark SUV, according to witnesses.

Police continue their hunt for Newsome who remains at large.

See Behind-the-Scenes Photos of XXXTentacion at the 2017 XXL Freshman Shoot

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