If she was wearing a wire, she would not have shot him.
so far, Andre' & "Lurch" will both testify that angry Hope came to see Stefano, and he ordered them to leave. So SHE was last person known to have been with him.
I have no idea how this story is going to go, but Rafe would really be putting his job, himself on the line if he attempts to cover this up for Hope, make up a story/alibi, etc.
Yes, I agree that Stefano is guilty of a lot of dastardly deeds, deserved long ago to spend the rest of his life in prison.
But for Hope to ignore her family, let someone cover this much for her?? That just is not Hope......and she is just really not herself.