The lawyer for JonBenet Ramsey's brother Burke, accused in a new documentary of carrying out her murder, has said his client would happily take a lie detector test to prove he didn't do it.
Almost 20 years on from the murder of the child beauty queen, the case is still unsolved.
The six-year-old was found dead in her family's home in Boulder, Colorado, on December 26, 1996 around eight hours after she was reported missing.
She had a broken skull from a blow to the head and had been strangled. A garrotte was found tied around her neck.
A new CBS documentary aired on Prime on Sunday night. The program alleges the brother, Burke, killed his sister when he was just nine years old.
The evidence it points to includes a flashlight found on the bench that could have been used to hit her with, the fact he appeared unconcerned with his sister's death in interviews, and suggested she'd been killed by being hit with a heavy object.
Burke is rubbishing the claims, saying he is willing to take a lie detector test if police as him to do so.
But his lawyer Lin Wood, who is now suing CBS, told The Sun: "Burke Ramsey doesn't have anything to prove."
"If the Boulder Police Department called me and said 'we'd like to talk to Burke and have a lie detector test done', yeah I'm happy to consider it.
"But that's never going to happen because the Boulder Police and the Boulder District Attorney's Office have recognised that Burke Ramsey is not even a possible suspect."
Mr Wood believes the show perpetrated fraud on the viewers.
"Anyone who thinks there is a basis for Burke Ramsey to take a lie detector test because of an accusation on a TV show is an idiot."
Entertainment reporter Dylan Howard was involved in another documentary on the murder, and says he doesn't believe the CBS documentary's findings.
"I don't believe that theory for one moment - it seems implausible and there really is no evidence to prove understandably 100 percent confirm that theory beyond a theory.
"Every theory is plausible to an extent. Police have not been able to solve it, many other investigators have not been able to solve it and unfortunately that's what makes it this enduring mystery."