Shannon Charles Thomas (July 27, 1971 – November 16, 2005) was a murderer executed by lethal injection by the U.S. state of Texas. He was convicted of the Christmas Eve, 1993 murder of 10-year-old Maria Rios and her 11-year-old brother, Victor Rios, in their Baytown, Texas home. His accomplice, Keith Bernard Clay (February 18, 1968 – March 20, 2003), was also executed by the state of Texas for the murder of a gas station clerk.