So it could well be that this dizzy dame has that legal concept in mind when she makes this laughable comment.
“There’s a legal name for the concept but I can’t recall it. “
Felony murder.
When someone dies because you were committing a felony. It can even be someone who was committing it with you.
So A and B go to C’s store, A points a gun at C’s face and demand that C hand over the money in the till, and C shoots and kills A, B can be charged with murder of A.