Let's see... How do I say this without being offensive? The fifth and fourteenth amendments couldn't possibly be any more related to protecting against murder. An elementary grammatical analysis couldn't make it more clear.
Amendment V
No person shall...be deprived of life, liberty, or property, without due process of law...
Article I, Section 8.
"The Congress shall have Power...To make all Laws which shall be necessary and proper for carrying into Execution...all...Powers vested by this Constitution in the Government of the United States, or in any Department or Officer thereof."
If we cannot agree on plain language and definitions, on what can we agree?