Parents of children killed in the Sandy Hook shooting have started two separate legal proceedings against Infowars host Alex Jones for defamation.
Jones has long used his radio show to claim the attack on Sandy Hook Elementary school, where 20 children and six adults died, was "completely fake".
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He's implied the parents are actors employed to undermine laws allowing for private gun ownership.
Now, five years after the attack, parents of the children killed have accepted Jones is not going away with his claims and have launched lawsuits asking for US$1 million (NZ$1.36 million) in damages.
Leonard Pozner and Veronique De La Rosa, whose six-year-old son died at Sandy Hook, launched their suit in Jones' home state of Texas.
In June 2017, a Florida woman who believes the attack was faked was sentenced to five months in prison for making death threats to Mr Pozner.
"This conspiracy theory, which has been pushed by InfoWars and Mr Jones since the day of the shooting, alleges that the Sandy Hook massacre did not happen, or that it was staged by the government and concealed using actors, and that the parents of the victims are participants in a horrifying cover-up," the lawsuit says.
Jones has also refuted Neil Heslin's story of holding his son Jesse's body with a bullet hole in his head following the shooting.
Mr Heslin launched his own suit against Jones in Travis County, Texas.
"This heartless and vile act of defamation reignited the Sandy Hook 'false flag' conspiracy and tore open the emotional wounds that plaintiff has tried so desperately to heal," the complaint said.
Jones is yet to comment publically about the lawsuits.