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Former NBA player MarJon Beauchamp was briefly detained -- then quickly released by police -- after trying to break up a fight between friends ... but, before they let him go, all those around him were in for a treat as he flashed his abs.
See for yourself -- the former Philadelphia 76ers hooper had his body on full display just before 3 AM in Seattle, Washington, while police spoke to him about the incident.
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You can see he appeared to be entertaining the police ... even cracking a smile at one point before being let go without incident.
A source familiar with the situation tells us ... MarJon was hanging out with a bunch of high school friends in Seattle's Belltown neighborhood when two of them got into a fight.
We're told ... MarJon tried to defuse the brawl -- which is when one of the guys swung at him, forcing him to defend himself. Another source claims the fight between MarJon's friends was over women.
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The cops were called and shirtless MarJon was detained.
A handful of women stuck around the scene, too ... and we have a feeling they didn't look away as they soaked up the sight of the athlete's rock-hard physique.
MarJon is currently in the off-season -- he's a free agent after playing 14 games for the Sixers last year -- but it seems like he's ready to hit the court ASAP!