The Texans began their 2007 campaign at home against the Kansas City Chiefs.  After a scoreless first quarter, Houston came out pounding in the second quarter with kicker Kris Brown getting a 26-yard field goal, while QB Matt Schaub completed a 77-yard touchdown pass to WR Andre Johnson.  In the third quarter, DE Mario Williams showed his reason for being last year's #1 overall pick by returning a fumble 38 yards for a touchdown.  Afterwards, the Chiefs got their only score of the game with kicker Justin Medlock nailing a 27-yard field goal.  In the fourth quarter, the Texans sealed the victory with Brown kicking a 28-yard field goal. Matt Schaub, in his Texans debut, went 16 of 22 for 225 yards with 1 touchdown and 1 interception.
Question: Which defensive player got a turnover that resulted in a touchdown?
Answer: DE Mario Williams