Phil Niekro, Hall of Fame Knuckleball Pitcher, Dies at 81 - The New York Times
Phil Niekro Dies: Hall Of Fame Knuckleball Pitcher Was 81 – Deadline
CardCorner: 1988 Topps Joe Niekro
Joe Niekro - Wikipedia
Baseball great Phil Niekro dies of cancer at 81
Why are there no knuckleballers in professional baseball anymore? Is it a physiological issue, the difficulty catching a knuckleballer, or something else? - Quora
With Phil Niekro's Death, Baseball Has Lost the Knuckleball and Its Master - The New York Times
Phil Niekro, Hall of Fame knuckleballer, dies of cancer at 81
Aug. 3, 1987: That time Joe Niekro tried to hide evidence of cheating, then got busted
Knuckleball 101
Phil Niekro, Hall of Fame Knuckleball Pitcher, Dies at 81 - The New York Times
Baseball Hall of Famer Phil Niekro, whose knuckleball fooled batters for 24 years, dies at 81