Roy Williams decided to retire as the head coach of North Carolina on Thursday, leaving a massive void for the Tar Heels. While everyone wonders who is going to replace the Hall of Fame coach, Williams revealed the main reason why he chose to retire from college basketball.

For just about every year, from 2003-2018, North Carolina was one of the best teams in college basketball every season. Over that span, Williams led the Tar Heels to three National Championships and an appearance in the NCAA Tournament in 15 out of those 16 years.

However, in the past two seasons, North Carolina has come down to Earth as they've combined for a 32-30 record since 2019. Despite being able to sneak into the NCAA Tournament this season, the Tar Heels were eliminated in the first round, making it the first time a North Carolina team coached by Williams did so.

Williams, who turns 71 years old in August, is one of five coaches in college basketball history to achieve 900 or more wins as a head coach. The legendary coach was able to reach 903 victories before he called it quits, surpassing Dean Smith on the all-time list.

There's no doubt that North Carolina has long been considered a desirable program to attend for notable prospects. But with times changing, Williams doesn't believe that he has what it takes to lead the Tar Heels to success.