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I received a letter in 2020 that my investment is now worthless.  I had previously received K-1's with tax year 2018 being the last one received.  The letter said no K-1 will be issued for the 2020 tax year.  where do I enter this loss (passive) in Turbo tax.  I originally purchased my interest in the company in 2006.  Do I enter this in the K-1 section or stock loss in 2020?  As I did not and will not receive a K-1 for 2020, the section of TurboTax for K-1's only allows entries if I received a K-1.  Any help is appreciated.