Exactly. It is obviously him. But the spin she is putting on the story ( to protect what really happened between them both that night ) is putting up a smoke screen to add the element of doubt.
They were probably high on drugs, got in a huge fight, he took back her ring, hit her, she ran off and reported the situation to the Police. Then realised, if she pressed charges, her drug use etc would come out. She is protecting him, to protect herself.
Watch this space for the ring to magically reappear on her finger.