Houston lawyers Friday filed a complaint against a former North Texas prosecutor, claiming he lied about cutting a deal with a witness that helped send a possibly innocent Corsicana auto mechanic to his execution. The complaint against John Jackson was lodged with the State Bar of Texas to spotlight the former prosecutor's alleged perjury during a 2010 court of inquiry called to review the murder case. Jackson has denied that he offered special consideration to the informer in return for testimony, but Willingham supporters said they have documentation that Jackson intervened for the man when he later was incarcerated in state prison.