Former XFL player Darez Diggs -- the brother of NFL stars Stefon and Trevon Diggs -- helped orchestrate the brutal attack of a man in an elevator earlier this week ... new video, obtained by TMZ Sports, shows.
The incident happened on May 29 in an apartment building in downtown Los Angeles ... and in the footage, you can see the altercation starts in an elevator lobby.
The clip shows after one of the elevators stops ... a man gets out, exchanges words with Darez -- and then retreats back inside the lift quickly.
The man then can be seen frantically trying to close the elevator's doors ... but before they close, Darez -- who also goes by Mar'sean Diggs -- stops them with his hand.
Darez then gets into the elevator and trades more words with the man ... before two of Darez's apparent acquaintances run in with fists flying.
The footage shows the men pummel the guy to the ground, ripping off his jewelry in the process. At one point, you can see one of the men kicks the guy in the face -- before they drag him into the lobby.
The men all stand around talking further ... before they seem to rip another chain off the guy's neck.
Darez then seems to leave everyone in the lobby in a different elevator.
The LAPD tells TMZ Sports ... they were called to the scene, but the suspects had already fled when officers arrived.
Cops tell us a report for a robbery was taken -- saying the complainant told them three men had stolen an orange purse containing diamonds and other jewelry during the incident.
So far, no arrests have been made ... but police say an investigation remains ongoing.
Darez played college football at Morgan State before transferring to the University of Alabama at Birmingham. He went on to play safety for one season for the XFL's Los Angeles Wildcats in 2020. He now works in the fashion industry -- running his own lifestyle brand called Blue Boii.
Our attempts to reach Darez through the clothing line was unsuccessful.