Ken Griffey Jr, Seattle Mariners Stock Photo - Alamy

Seattle Mariners Ken Griffey Jr. (24) in action during a game from the1996 season against the Milwaukee Brewers at County Stadium in Milwaukee, Wisconsin. Ken Griffey Jr. played for 22 years with

Seattle Mariners' Ken Griffey Jr., right, walks past Felix Hernandez and onto the field before the Mariners' baseball game against the Los Angeles Angels on Tuesday, April 14, 2009, before a baseball

Seattle Mariners' Ken Griffey Jr. watches his 624th career home run during a baseball game against the Cleveland Indians on Sunday, August 23, 2009, at Progressive Field in Cleveland, Ohio. (AP Photo/David

Seattle Mariners' Ken Griffey Jr. watches his two-run double during the fifth inning of a baseball game against the Chicago White Sox in Chicago, Wednesday, April 29, 2009. At left is Chicago

Ken Griffey Jr, Seattle Mariners Stock Photo - Alamy

Seattle Mariners' Ken Griffey Jr. looks on from the dugout before a baseball game against the Baltimore Orioles, Wednesday, May 12, 2010, in Baltimore. (AP Photo/Nick Wass Stock Photo - Alamy

Seattle Mariners Ken Griffey Jr. Los Angeles Angels Wednesday, April 15, 2009, in the inning during a baseball game in Seattle. (AP Photo/Elaine Thompson Stock Photo - Alamy

Former Seattle Mariners second baseman Harold Reynolds, left, greets Seattle Mariners' Ken Griffey Jr. after Griffey caught Reynolds' ceremonial first pitch Tuesday, April 14, 2009, before the Mariners' baseball game against the

Seattle Mariners' Ken Griffey Jr. is congratulated by teammates as he returns to the dugout after his seventh inning home run during game one of the American League division playoff series against

Seattle Mariners Ken Griffey Jr. hits a two-run home run against Minnesota Twins bullpen pitcher Jose Mijares in the eighth inning at the Metrodome in Minneapolis, Minnesota, Sunday, May 10, 2009. The

Seattle Mariners' Ken Griffey Jr., right, walks past Felix Hernandez and onto the field before the Mariners' baseball game against the Los Angeles Angels on Tuesday, April 14, 2009, before a baseball

KEN GRIFFEY JR.(Seattle Mariners) 1997.k9033jw. © Jerry Wachier/Globe Photos/ZUMA Wire/ZUMA Wire/Alamy Live News Stock Photo - Alamy

Seattle Mariners' Ken Griffey Jr. follows through on a single to right off a pitch from Kansas City Royals' Zack Greinke in the first inning of a spring training baseball game in