What is who is the gravedigger in bones?

As an AI language model, I do not know if you are referring to "Gravedigger" or "The Grave Digger."

If you are referring to "The Grave Digger" from the TV show Bones, then it is a serial killer who first appeared in season two. The Grave Digger abducts people and then demands a ransom from their families. If the ransom is not paid, the victims are buried alive. The character was portrayed by actor Deirdre Lovejoy.

If you are referring to "Gravedigger" from the book Bones by Kathy Reichs, then it is a nickname given to a character named Jim Gallo. Gallo is a construction worker who is arrested for stealing a truckload of skeletons. He is suspected to have also stolen bones from a burial plot, which is why he is nicknamed "Gravedigger."