As in New York, a criminal defendant may not successfully sue his criminal defense attorney absent a showing of "actual innocence"
Here is the Texas rule:
"In Butler v. Mason, No. 11-05-00273-CV, 2006 Tex. App. Lexis 10886 (Tex. App.—Eastland 2006), a convicted murderer attempted to bring a legal malpractice action against the attorney who