The Texas Republican is the first member of Congress to die after being diagnosed with the coronavirus.
The actor who played Screech is undergoing treatment in Florida.
"The Big Lebowski" star has been updating fans on his treatment since announcing his diagnosis in October.
A spokesperson for the actor who played Screech said tests were being done and "it doesn't look good."
“We’re heartbroken to have to announce our beautiful daughter Francesca passed away last night in the arms of her mom and dad,” Kaczynski tweeted.
The longtime and beloved "Jeopardy!" host died earlier this month after a lengthy battle with the disease.
“When the surgeon tells you the best way to ensure you will be alive in five years is to remove your entire nose ― well, ‘shocking’ doesn’t begin to cover it.”
He was known for his wit and fast-paced delivery, and won the Guinness World Record in 2014 for “the most episodes ever hosted by the same presenter.”
The singer-actress is focusing her time on staying healthy and helping fellow cancer thrivers.
I am one of tens of millions of Americans who went bankrupt due to illness.