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The burned remains recovered from a quarry site adjacent to the Avery’s Auto Salvage property were several pieces of bone of which some appeared to be burned, while others showed no sign of being burned. A forensic anthropologist determined that all of the unburned bones and the majority of burned bones were nonhuman, but a portion was too fragile to be tested, among them a bone that had characteristics of a pelvis bone. These bones were determined "suspected possibly human" as no determination could be made.
In Making a Murderer season 1 the burned remains from the quarry are offered as potential evidence of a burn site outside the Avery’s Auto Salvage property. If true, and if the remains were proven to be human, it would indicate Avery’s innocence, as he wouldn’t burn a body away from his property only to bring the remains back to his property afterwards.
In the documentary-series’ second season Steven Avery’s postconviction attorney Kathleen Zellner claims to have evidence that some of the remains from the quarry were indeed human.