They may be able to imply...but if he pleads guilty but insane, he can be examined by the prosecution chosen psychiatrist..Narcissism isn't insanity in that they know what they are doing is wrong...
He will know all the tricks and talk about"voices", I fear!
Back to the case before us.
Refer to post 164 and scroll down to (3)(b)(i-ii). Hacking killed two persons [see post 164, (1)(b)] and, as the statute is written and as I construe it, it wouldn't matter legally if he didn't know she was with child. Unless I'm misconstruing the statute and case law says otherwise, defense is carrying a large burden here.