Grizz Chapman, an actor best known for his role as Grizz on the NBC hit television series “30 Rock,” died on Friday. He was 52. His cousin, the Harlem Globetrotter Donte Harrison, confirmed Mr. Chapman’s death on social media. A cause of death was not given, but Mr. Harrison said Mr. Chapman died in his sleep “after years of fighting illness and dialysis.” While there are several acting credits listed to Mr. Chapman’s name on IMDb, his role on “30 Rock” as a member of Tracy Morgan’s entourage