The main topic across the NFL this week has been the start of training camp for many teams, with the Houston Texans kicking off their camp on July 23. Former Texans safety Tyrann Mathieu was one of these players.

Tyrann Mathieu's retirement has sparked speculation about a possible comeback and potential Chiefs betrayal. Uncover all the details.

I can feel his energy everywhere,” Sammy Watkins said of Tyrann Mathieu almost 6 years ago. It’s still true for anyone who has spent time with Mathieu.