Remember if they can't find a body, or any proof the said person is dead, then they got no murder case against you, or at the very most, they have a very weak case. If they can't prove beyond a reasonable doubt the said person is even dead, then you are gonna walk. Very few murderers have been convicted in cases where no body was found.
Another good skill to have is the ability to keep a poker face, and not send off vibes that imply you are nervous, especially when talking to the police about a crime you actually committed. You should maintain a cocky and arrogant mindset that they got nothing on you, and that you have nothing to worry about. It might even be a good idea to offer to be as helpful as you can, to send the message to them that you have nothing to hide. Especially if you know they aren't even close to getting to the bottom of it, or if they want to search somewhere you know they will find absolutely nothing. Part of the game is convincing the investigators you aren't their man.
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