Turbotax is not licensed for use by paid preparers, and it is violation of IRS regulations to do so.
If your preparer used Turbotax online, you may be able to take control of your account by contacting customer support and providing proof of your identity. https://support.turbotax.intuit.com/contact/
If your preparer used Turbotax installed on their own computer, or one of Intuit's professional programs, you would need to obtain the complete file (pdf of "all forms and worksheets") from their executor or agent. A true CPA would have a contingency plan and someone would take over custody of their records. (A street corner semi-pro who used Turbotax illegally might not.)
If you can't get any documents from your preparer's files, you may be able to get the information you need from your IRS transcript. https://www.irs.gov/individuals/get-transcript
