There are a number of cases that have always bugged me or seemed that despite evidence available, they remain unsolved. So some popular cases on this forum that have always bugged me and seem unsolvable without more information are below. What cases do you think cannot or are unlikely to be solved without someone with information coming forward. I also think that lack of information leads people to come up with fantastical scenarios, when the reality of what happened is usually far more mundane.

For me it’s these cases:

Brian Shaffer - no information or progress in several years. I don't think the Big Tuna has anything to do with his disappearance.

https://en.wikipedia.org/wiki/Disappearance_of_Brian_Shaffer

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JonBenet Ramsey - the whole crime scene and history are so obfuscated that no one seems to know what's fact or rumor

https://en.wikipedia.org/wiki/Killing_of_JonBenét_Ramsey

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Asha Degree - nothing with this one makes any sense to me

https://en.wikipedia.org/wiki/Disappearance_of_Asha_Degree

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Jennifer Kesse - I think she was abducted and murdered by someone she knew, but not necessarily known to friends, family, or investigators. I don't think the workers in the apartment complex had anything to do with the disappearance and statistics (vastly) suggest she was killed by someone she knew.

https://en.wikipedia.org/wiki/Disappearance_of_Jennifer_Kesse