05:21 PM ET 05.23 | The football player formerly known as Honey Badger is officially under contract. Former LSU defensive back Tyrann Mathieu signed a four-year deal with the Arizona Cardinals on Thursday, the team announced. Mathieu was Arizona's third round pick in April's NFL Draft, "I'm part of a family now, so I'm obligated to the community and the entire Arizona Cardinals organization," Mathieu said, according to the Cardinals official website. "The Bidwill family, Steve Keim, the coaching staff, I'm obligated to everybody now, it's my responsibility." Mathieu was spectacular in two seasons at LSU, but was dismissed from the team in August after failing several drug tests. Despite his off-the-field troubles, Mathieu always believed he would end up in the NFL, "I never doubted it," Mathieu said. "I knew it was a long shot and it would be a process, but to finally sit down and sign my name on the dotted line means a lot to me."