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Well, you could use a piece of food, and then eat the murder weapon.
The only problem is that you can't really kill someone with a piece of bacon or toast. Perhaps a rather large watermelon.
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Actually...
Roald Dahl's "Lamb to the Slaughter" has a wife kill her husband with a frozen leg of lamb, she starts to cook it, then calls the cops. She then feeds the leg to the cops because they were nice enough to stay at the house during the night to protect her, or something like that.
Oh, spoilers.