Can sense death: Y! Abigail is like three seconds away from being dead in canon, literally bleeding to death on the floor and she knows she's dead so it will not be a surprise to her. She hasn't died yet in MoM, the Porter is the only reason she is alive tbh.
Visible cause of death: She actually has a visible scar still on the left side of her throat! So handy tbh. So any marks/signs would be there for him to see. She's had two attempts in the same place, so if you want him to see two marks that would be fine with me. :)
Command level: N/A