This sounds like an implausible hypothetical; the statute say that if an agreement is voided, the first attorney is entitled to a reasonable fee, and I don't believe a single judge would find it reasonable for an attorney to earn a $75,000 fee for bad work on a case that grossed $100,00 for the client. Are you asking about reality, or is this is law school question?
Did you get a notice of right to arbitrate the fee dispute with the bar assn from the 1st lawyer/ He must provide that before he can sue. the fee arb isnt binding unless the parties agree to make it so. Have you been sued in court by the 1st atty? Has that case concluded with a judgment as you described? In Ca, the 2 attys must share the fee, and normally do so based upon many factors, such as the time spent, the nature of the actual services provided, the quality of work, etc. Atty 2 should be assisting you on this. Did atty 2 actually try the case to verdict, or did you get a settlement in the case? Contact the Bar if you have further questions, assuming the 2d atty isnt helping.
Sign up to receive a 3-part series of useful information and advice about personal injury law.