You can amend your 2018 tax return to delete the K-1. Along with your amended tax return (which can only be printed and mailed) you can include the support for your claim that the K-1 is not legitimate.
Your $10K investment is a loss from investment fraud. TurboTax does not support tax losses from investment fraud. The tax treatment (e.g., theft vs. capital loss) depends on factual determinations best handled by an attorney. I recommend consulting a tax professional to work through the specifics of your situation.
Note that there is special IRS guidance for victims of Ponzi investment schemes. Even if your situation does not meet the definition of a Ponzi scheme, the IRS guidance on Ponzi schemes at this link (including the associated Revenue Procedures) may provide support for how you treat the $10K investment loss for tax purposes.
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