Marvin Williams on the potential end of NBA's "one-and-done" rule Posted Feb 22, 2019 Charlotte Hornets veteran Marvin Williams said what he experienced at Chapel Hill for a year - not only the basketball refinement, but the socialization college provided - is something he never would trade away. He said that probably contributed to his longevity, in his 14th NBA season. He gives much credit in that regard to North Carolina coach Roy Williams. (Charlotte Observer)