A woman from Rohnert Park is behind bars on suspicion of attempted murder after a stabbing in Rincon Valley. Police say 21-year-old Ruby O’Brien got into a fight with the 23-year-old victim and stabbed her on Saturday morning. The victim was found on a sidewalk, where police say O’Brien had dropped her off. The victim has life-threatening injuries. O’Brien was later arrested after a traffic stop.