In addition I would provide a timeline for them to respond. Writing a termination letter to an attorney requires clarity, formality, and a record of the decision to end the legal representation.A disengagement letter serves to make clear that a client has ceased to be a current client for conflict of interest analysis. You have to make it crystal clear in writing: have the insurer's claim number AND the WCAB case number on the letter. This article addresses the rules governing California lawyers who seek to withdraw or disengage from representing a client in civil proceedings. Sometimes, an attorney must withdraw from representation. This must be done in a way that does not prejudice the client. Do you know how to find out if you are a beneficiary on a bank account? Send Notices to: Claimant. Attorney. Special thanks to NLG Jailhouse Lawyer Vice President Mumia Abu-Jamal.