WOW!  This attorney is treading on some seriously thin ice...   remember:  the attorney client privilege is the CLIENT's privilege to waive or not.  The attorney may NOT disclose confidences and secrets in this case.  An ineffective assistance of counsel (IAC) motion does not trigger a right of the former attorney to start talking.  However, if the two murders were somehow related and the client prevented the attorney from using certain information (or the attorney could not use certain testimony because of facts that hooked up the two crimes, for instance), then that may be a different story.   BUT, it is very unusual for the lawyer to get involved in a subequent IAC hearing.