Bethany's Hitter was previously an anonymous character, but later to be revealed as Mona Vanderwaal had hit Bethany before Melissa buried her alive.
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The night Bethany escaped Radley and wandered into the DiLaurentis' backyard, Mona had followed her thinking she was Alison. Mona was very angry and finally, thinking about everything Alison did to her, she picked up the shovel and hit Bethany from behind. Mona left the scene and was surprised later to find Alison ragged and scared but alive.