"Not only was Jason the most talented, humble and hardest working individual on the football team, but he was also one of the most genuine, good-hearted you could ever meet," Romo wrote.
Witten joined the Cowboys in 2003, one year before Romo arrived in 2004. The latter became the starting quarterback in 2006 until injuries caused him to retire in 2017. The two spent 13 years on the same team, and Romo believes his friend became a role model for future generations.
"Jason, you have set the standard for every player and coach who walks through the Cowboys facility that there's one way to play and one way to practice."
Romo immediately went into broadcasting after his retirement, getting a job with CBS last season. Witten will do the same beginning in 2018 after being hired by Monday Night Football.