I doubt it seriously, but that definitely will take a death bed confession to prove it, and Mrs. Ramsey is already dead. Mr. Ramsey remarried and now lives in Michigan
Per Wiki: Boulder DA released this statement in 2008:
On July 9, 2008, the Boulder County District Attorney's office announced that, as a result of newly developed DNA sampling and testing techniques known as
Touch DNA analysis, the Ramsey family members were no longer considered suspects in the case.
[15][16] In light of the new DNA evidence, Boulder County District Attorney Mary Lacy gave a letter to John Ramsey that same day, officially apologizing to the Ramsey family:
This new scientific evidence convinces us ... to state that we do not consider your immediate family, including you, your wife, Patsy, and your son, Burke, to be under any suspicion in the commission of this crime....
The match of Male DNA on two separate items of clothing worn by the victim at the time of the murder makes it clear to us that an unknown male handled these items. There is no innocent explanation for its incriminating presence at three sites on these two different items of clothing that JonBenét was wearing at the time of her murder.... To the extent that we may have contributed in any way to the public perception that you might have been involved in this crime, I am deeply sorry. No innocent person should have to endure such an extensive trial in the court of public opinion, especially when public officials have not had sufficient evidence to initiate a trial in a court of law.... We intend in the future to treat you as the victims of this crime, with the sympathy due you because of the horrific loss you suffered....
I am aware that there will be those who will choose to continue to differ with our conclusion. But DNA is very often the most reliable forensic evidence we can hope to find and we rely on it often to bring to justice those who have committed crimes. I am very comfortable that our conclusion that this evidence has vindicated your family is based firmly on all of the evidence.