Tammy Lynn Sytch -- also known as 'Sunny,' in the ring -- is behind bars over a fatal car crash from last month that cops say was caused by her being under the influence.
The former WWF star was arrested Friday night and hauled off to the Volusia County Jail -- where was booked on a number of charges ... including felony DUI manslaughter, the most serious of the offenses. She was also rung up on 8 other charges, most being DUI related.
One charge she was booked on accuses her of driving on a suspended/revoked license, and then causing great bodily harm and/or death as a result.