Can't answer because the question is execution, the question (IMHO) should be charged with murder.
For decades we have been told that abortion is "murder", however in states that are banning abortion the person criminally responsible is the abortion provider. That makes no logical sense. If abortion is murder, then the woman should be charged with the same type and level of crimes for seeking ("attempted to...") or having an abortion. Therefore women should be charged in with the same crimes.
So...
A woman hires a contract killer to kill her husband, she and the killer are charged with murder.
A woman hires a contract killer to kill her unborn baby, and the killer should be charged with murder.
WW