12:15 PM PT -- Boykin released the following statement:

"I understand the Seahawks decision to release me. The story that was reported casts a bad light on the organization and on me.

I want to be clear that the story is false. The police have taken statements from the accuser, another witness and me. All of these statements confirm that I was not involved in the physical altercation.

This woman has lied about me and it has cost me my job. I know guilt by association is real. This person has fabricated a story and I am suffering the consequences.

I will let the legal system run its course and I know I will be vindicated."

10:23 AM PT -- The Seahawks just announced they've cut Trevone Boykin.

Trevone Boykin is being investigated by police for allegedly breaking his girlfriend's jaw ... TMZ Sports has learned.

Cops in Mansfield, Texas tell us they are investigating Boykin, 24, for allegedly severely injuring his longtime girlfriend, Shabrika Bailey, during a physical altercation last week.

The Seahawks QB and Bailey have dated for years.

Bailey talked to WFAA in Texas ... telling them her and Boykin were arguing over a text message when he started to choke her. She says she lost consciousness ... before waking up in a pool of her blood.

She says Boykin eventually took her to a hospital ... but fled the scene when the hospital staff questioned her about the injuries.

Law enforcement sources tell us they expect Boykin to be charged with aggravated assault -- a felony. however, there is not currently a warrant out for his arrest.

This isn't Boykin's first time in trouble with the law ... he was charged with assault after getting in a bar fight in 2015 -- 2 days before he was supposed to play in the Alamo Bowl.

He ended up getting a year probation in that case.