Jason "Mayhem" Miller, troubled MMA fighter, has been charged with 2 felonies -- assault and battery -- for his alleged involvement in a bar fight where he's accused of breaking another man's ribs, TMZ Sports has learned.
We broke the story ... 40-year-old Miller was allegedly involved in a brawl outside a San Fernando Valley bar in early September. The man Mayhem is accused of hitting initially decided not to file a police report ... however, changed his mind after going to the hospital, where he was diagnosed with cracked ribs.