Assist me bear in mind the case concerning the lacking household. : TrueCrime

I’m attempting to recollect this case concerning the lacking household that occurred within the 80s(?). I feel the lacking household was mother, brother and sister. The killer or kidnapper took an image of a shallow grave (presume to be the murdered household) with an odd statue (cross? Flower?) on prime of the mound.

No one (FBI and cops) can establish the geographic location. I feel it was in a mountainous space.

This case been bugging me and the image of the mound occurred to return again in my thoughts.

I do know I might be fallacious however that’s all I can bear in mind.

Does anybody know the case I’m taking about?