The Chicago Tribune was a finalist among the nominees for a Pulitzer Prize in national reporting for its series of articles on the case of Carlos DeLuna, a likely innocent wrongly convicted and executed by the state of Texas in 1989. The Boston Globe won the Pulitzer for its reporting on President Bush's use of signing statements. More information is here.
The Tribune series "Did this man die ... for this man's crime?" appeared in June 2006. It was reported by Maurice Possley and Steve Mills.
Mills and Possley also broke the story of Todd Willingham, another likely innocent executed by the state of Texas in 2004. The article, "Texas man executed on disproven forensics," was part of a series on forensic science.