Another turn in the LeSean McCoy home invasion saga ... with the NFL star being cryptically warned by the alleged victim's friend -- "You know I know everything."
The woman behind the thinly veiled threat goes by "Mia" -- she's the person who first published the bloody photos of Delicia Cordon on social media and blamed McCoy for the attack.
Initially, Mia spelled out her case against LeSean -- calling him a "devil" -- and accusing him of using steroids, attacking his own child, his dog and Delicia.
McCoy put out a statement adamantly denying Mia's allegations -- and a short time later, she deleted her post.
But Mia wants everyone to know she's NOT backing down -- and only pulled her post on the advice of Delicia's attorney.
She has now published a NEW post calling LeSean "Shady" McCoy a liar.
"For the record Delicia's lawyer forced me to remove that post. I stand by what I said," Mia wrote.
"I've personally addressed @leseanmccoy on everything that was stated many many times over the years. Lie to these people if you want Shady, but you know I know everything."
Cops are investigating -- as are the Buffalo Bills and the NFL.
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