Rickey Henderson, who turned 50 on Christmas Day, is considered a lock to join baseball's immortals in Cooperstown with the Class of 2009 is unveiled by Hall of Fame president Jeff Idelson beginning at 12:30 p.m. Monday on the MLB Network and MLB.com.The only real drama surrounding the announcement is whether Henderson will eclipse Tom Seaver's record of being named on 98.84 percent of the ballots. No player has ever been elected unanimously.