His death was announced on Monday and was first reported by Tony Ortega on his website, The Underground Bunker.
Radar has learned those closest to Ron are fulfilling his dying wish by making sure his wife, Becky Bigelow, won't get caught drowning in bills to pay for his funeral, despite his son's reported multimillionaire status.
The Scientology leader's net worth is believed to be around $10 million, but the two had a falling out when Ron left the church.
Despite their strained relationship, Ron once claimed that David gave him money when he was no longer a church member.
Speaking to 20/20 in 2016, Ron said he reached out to David after he made his "escape" off a Scientology base.
“In that letter, I said, ‘Hey, listen, I spent a lot of years in the Sea Org, I couldn’t live under those conditions, and I have very little money paid into social security. If you can give me some financial help, I would appreciate it,’” Ron told the outlet.
He revealed his son gave him $100,000 to buy a house.
Ron wasn't convinced the gesture was in good faith.
“Maybe he read it and he’s thinking, you know, ‘he is my old man and he’s old, maybe I’ll help him out,’” he revealed. “And then on the other hand… I think, ‘well, maybe he did it just so it would be insurance that I wouldn’t do anything.’ And I wasn’t going to do anything.”
Ron later wrote a book titled, Ruthless, which exposed the Church of Scientology and David Miscavige's alleged misuse of power. He called the influence his son has over so many people "toxic."
His beloved friend and co-author Dan Koon addressed his death in a touching letter, revealing "it broke his heart" when his family was "forced to disconnect from him" following his escape.
"To that we must give a big FU to David Miscavige," Koon wrote on Monday, adding, "The one who never deserted him was his #1 son, Ronnie."
Ron was 85 years old.