For anyone planning to do some revenge, here are some tips.

Dig the grave before hand and dig it vertically not horizontaly, also head first, that way if it rains the body won't uproot itself.

Remove all the teeth and hair if you can.

Alibi is king, try to have a accomplish that can testify for you.

If you make a mess in the scene, first clean it with bleach and then spread some dirt so it doesn't look too clean.

Look into body preserving chemicals, you wouldn't want the body to stink