He went on to say that "evidence at the scene suggested this could be an accidental overdose".
According to CBS News, officials in Arizona's Maricopa County said Horner's body was found in his bed inside his Phoenix home on September 18.
In 2016, Horner posted a fake story to several of his sites claiming a former Secret Service agent outed President Barack Obama as a gay man and a radical Muslim.
Often dubbed as the "fake news pioneer", Horner claimed the responsibility for President Donald Trump's win. The cause of death has not yet been finalized. He was under the influence of ketamine at the time of his arrest, police said.
Horner had written numerous false stories over the years, claiming that street artist Banksy died, that Obamacare would require people to get RFID chip implants, fake Ebola outbreaks, and that solar panel "drain the sun's energy" via his website, National Reporter, which launched in 2013.
But despite claiming some credit for his victory, Horner was a self-proclaimed hater of Trump who wrote his fictional stories in hopes of "messing with the campaign" and to prove "people are definitely dumber [today]", according to the New York Post. Horner said Trump's supporters didn't fact-check his stories before posting them.
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Despite the fact that no evidence existed, Trump repeated the charge about the paid protesters while on stage during one of his rallies.
"They'll post everything, believe anything", he said at the time.
The deceased's brother, J.J. Horner, in a Facebook post, said he died peacefully in his sleep.
Horner said while his brother was pigeonholed as a Trump supporter after a member of the Trump family shared one of his stories, he was always transparent about his views and it was obvious that he wasn't.
"I thought they'd fact-check it, and it'd make them look worse", Horner said.