This might be admissible, but only under limited circumstances. This would be okay if the prior lawsuit involved substantially similar claims and issues. Specifically, if your opponent in your CURRENT CASE had a reason and full and fair opportunity to cross-examine the witness in the PRIOR CASE, you may be able to get this testimony admitted at a hearing.
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Possibly, but your chances of successfully entering it into evidence without being represented by a competent attorney are probably pretty small.
You have several issues to deal with, including whether it is hearsay, if so whether there is an exception, whether you can lay the proper predicate for it, etc.