We're assuming bones here, not flesh, noting we are not privy to conditions of placement: fully exposed / lightly covered or partially or fully buried. The perp's DNA would not have the luxury of residing within and protected by bone material; his or her DNA, if any, would be from bodily fluid(s) or epithelial cells and likely would be degraded beyond reliable recognition.
If that's all true that leaves only potential physical evidence that might lead them to a perp; something personal, such as clothing, shoe, hat, cigarette, lighter, water bottle, camping / hunting equipment, etc. Tire tracks would not be usable in trial, even if cross-matched with a perp's vehicle... too much time and potentially too many animals, humans and vehicles through the area in 8+ years... and that also might affect DNA results: who's to say who was through that area and when? In fact, that logic could be applied to whatever is found on-site. From whom and when?
I'm thinking it's an uphill battle regarding forensics, other than LB's remains DNA.
The prosecution might need a confession... or at least someone who knows what-is and is willing to spill the beans.
