In a court filing, Madoff says he is suffering from terminal kidney failure and has less than 18 months to live.
RELATED STORY: Bernie Madoff Asks President Trump For Sentence Reduction
He was sentenced to 150 years in prison for using his investment firm to cheat clients out of billions of dollars.
The 81-year-old began his prison term in July 2009 after pleading guilty to 11 felony charges.
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