'Man of God': What happened to Tyler Ulrich? How did Southern Nazarene University student in Oklahoma die?

What happened to Tyler Ulrich? Oklahoma's Southern Nazarene University is mourning football player Tyler Ulrich, who died five days after suffering a serious head injury during a college football game. His coach called the 21-year-old Southern Nazarene University student a 'man of god' and an ultimate example of quiet strength, loyal, worker, joyous.