There was enough evidence to warrant a Grand Jury on the Ramsey's.
Stan Garnett, at that time the DA of Boulder and a close friend of one "Ramsey, John" was able to quash the jury.
The most viable explanation is mom, Patsy killed her accidentally after JonBenet wet the bed (which she had a history of doing).
Mom and dad had just returned home from an Xmas party if I recall, which likely means mom had a couple of cocktails in her, discovered JB had wet the bed and went into a fit of rage.
I dont think Burke was involved in her death but likely in the aftermath.
The whole story is fucked up, the first call they made was not to 911 or similar, it was to their travel agent.
The Ramsey's were dirty as fuck, the story of their daughter's death is more about money and corruption than it was about JB's death.
Rot in hell Patsy, John may you die a hideous death.