The older brother of JonBenet Ramsey is suing US broadcaster CBS and others for $US750 million ($A1 billion) over a television series that concluded he killed his sister.
In the lawsuit filed on Wednesday (US time), Burke Ramsey claims the network, its production company and the experts interviewed in the series on the unsolved murder permanently ruined his reputation.
Watch Burke Ramsey’s interview with Dr Phil
The six-part series aired in September ahead of the 20th anniversary of JonBenet’s death.
The six-year-old was found dead in the basement of her family’s home in Boulder, Colorado, the day after Christmas in 1996.
CBS spokesman Dustin Smith declined to comment on the lawsuit.
Mr Ramsey previously filed a lawsuit against a forensic pathologist who said Mr Ramsey bludgeoned his sister to death.
He is also named in the latest lawsuit, which was filed in Michigan, where Mr Ramsey lives.