Hof's campaign manager Chuck Muth echoed that statement on Twitter, saying that he "died quietly in his sleep."
Related: Photos: Notable deaths 2018
The AP reported that Hof had been campaigning for Nevada State Assembly District 36. He celebrated his birthday Monday night at a hotel on Pahrump, Nevada. Muth told the Reno Gazette Journal that Hof, who turned 72 Monday, was "having the time of his life," at the celebration.
Porn star Ron Jeremy, a friend of Hof’s, attended the party.
“Ron Jeremy found him this morning when he went to wake him to go to a meeting in Pahrump,” Muth said.
Former Maricopa County Sheriff Joe Arpaio attended the party, The AP reported. He supported Hof's campaign.
"The thing I liked about him: He was with Trump and was for the Second Amendment and lower taxes," Arpaio told The AP.
Muth said an investigation into Hof’s death is ongoing.