Chyna -- Off the Hook for Alleged Beatdown

TMZ has learned former WWE star Chyna will not face criminal charges over an alleged incident in which she allegedly beat the daylights out of another woman in a motel room in L.A.

As we previously reported, Chyna was named in a criminal complaint filed by a woman named Gabriela Targos -- who told LAPD cops that Chyna battered her so badly back in April ... she thought she was gonna die.

But now, the L.A. City Attorney has officially rejected the case, claiming there's "insufficient evidence" that can prove Chyna carried out the attack.