The final scene of the All or Nothing Cowboys docuseries focuses on Sean Lee watching film in the team's linebacker room.
The visual of Lee studying alone is used to demonstrate that although the 2017 season is over, he is already preparing for 2018.
At the time, Lee didn't know that a larger leadership role would be coming in about four months.
When Jason Witten decided that his 15th year in the NFL would be his last, Lee understood he had to take on more responsibility.
"There is no question," Lee said after a minicamp practice last month, "that I need to step up because he's gone.