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[ferny]

a big knife.

A big knife does the deed, but that's not how you get away with it.

Do it in a bathtub, and don't forget to buy bleach BEFORE you slice them up. You don't want to have to walk down the shops covered in claret.
Remove the hands, feet and head and dispose of them by putting them in a secure bag and add plenty of weight in there to. Chuck it in deep water and they won't find it for years. And when they do there won't be much left.

Oh and remember, dead bodies don't bleed, live ones do.........