(CNN)One of college basketball’s all-time coaching greats is calling it a career.

Roy Williams, who led North Carolina to three national championships and guided UNC and Kansas to nine Final Fours, is retiring after 33 seasons as a head coach, UNC said Thursday.His 903 wins — in 18 years at UNC and 15 at Kansas — are the third most in men’s Division I by a coach, behind only Mike Krzyzewski and Jim Boeheim.The 2007 Naismith Hall of Fame inductee intends to address reporters at a news conference in Chapel Hill at 4 p.m. ET, UNC said.Williams, who graduated from UNC in 1972, spent 10 years as assistant coach at North Carolina under legendary coach Dean Smith.Read MoreHe then took the Kansas job in 1988 and guided the Jayhawks to four Final Fours — including in 1991, when he beat his alma mater and mentor Smith in the semifinals but lost to Duke in the final.Williams took over the North Carolina program in 2004 and won his first national title with the Tar Heels in 2005, with future NBA first-round picks Marvin Williams, Raymond Felton, Sean May and Rashad McCants.His Tar Heels won two more national titles — in 2009, with players including Tyler Hansbrough, Ty Lawson and Danny Green, and 2017, with a roster led in scoring by Justin Jackson.North Carolina ended this season with a 18-11 record, bowing out of the first round of the NCAA Tournament with a loss to Wisconsin.This is a developing story and will be updated.Correction: An earlier version of this story incorrectly stated the results of the 1991 Final Four. Kansas defeated North Carolina in the national semifinals but lost to Duke in the final.

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