Troubled NFL QB Trevone Boykin has been charged with felony aggravated assault for allegedly punching his GF and cracking her jaw back in March ... and now he's facing 20 YEARS in prison.
TMZ Sports has learned ... Boykin was indicted for 2nd degree felony aggravated assault-serious bodily injury by a grand jury in Tarrant County, TX on Friday.
At the time of the incident, Boykin's longtime GF Shabrika Bailey claims he choked her and broke her jaw during a physical fight before finally taking her to the hospital for treatment.
As for Boykin, he's vehemently denied any physical altercation took place.