I watched a true crime type of show on TV years ago where a husband killed his wife and stuck her in the freezer. He then got a chain saw and cut her up into smaller pieces and rented a chipper took it down to a bridge over a river and proceeded to make fish food out of her.
They caught him after a state road worker wondered just what he was doing on a bridge in the middle of the night chipping things into the river. The cops eventually found a couple of teeth on the side of the river, and the chainsaw that he had dismantled and threw into the river.