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The estranged son of the founder of theWestboro Baptist Churchsaid his father is "on the edge of death."

Fred Phelps Sr. became famous for organizing picket lines of brightly-colored signs carrying hateful messages against tolerance during the funerals of military personnel and famous figures. His actions led toat least two federal and several state lawsrestricting protests during military funerals.

In a statement on hisFacebook page, Nathan Phelps, who has been estranged from his father for 30 years, said the senior Phelps was dying in hospice care in Topeka, Kan., and that he had been ex-communicated from his own church in August of 2013.

"I'm not sure how I feel about this. Terribly ironic that his devotion to his god ends this way. Destroyed by the monster he made," Nathan Phelps wrote.

"I feel sad for all the hurt he's caused so many," he continued. "I feel sad for those who will lose the grandfather and father they loved. And I'm bitterly angry that my family is blocking the family members who left from seeing him, and saying their good-byes."

© 2014 CBS Interactive Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.

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