"I read somewhere that the sheriff indicated Cesear left an extra pile of dirt from the grave he dug for Maria in his backyard"
He may have said that, and it makes sense. Usually, landscapers will use a tarp to place the dirt on from a hole so as not to affect the surrounding grass.
Cesar probably just spread the extra dirt around over the grass
No, Sheriff Brown said there was a mound of dirt about 6-8 inches tall next to the spot. He actually said most people would have thought that’s where she was buried. Then he went on to describe how he found her with his Magic Coat Hanger.