You can buy rat poison without a prescription. Put it in a fruit jar and mistake it for sugar and live happily ever after. At least my great-grandmother did after her drunken husband died accidentally.
I am already living Happily ever after. But if my EX die... I will get the other half of my Military Pension... simply... I don't need the money so... she can live. Now if I die... she won't get any. But if I ever drink your coffee it will be black... no cream or sugar.