Ken Griffey Jr, Seattle Mariners Stock Photo - Alamy

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

Former Seattle Mariners player Ken Griffey Jr., left, makes a face as he waits for former pitcher Félix Hernández, right, to notice him taking a selfie during Hernández's induction into the Mariners

Seattle Mariners Ken Griffey Jr. watches his single to right field in the eighth inning against the Detroit Tigers in a MLB baseball game Friday, April 17, 2009, at Safeco Field in

Ken Griffey Jr, Seattle Mariners Stock Photo - Alamy

Ken Griffey Jr, Seattle Mariners Stock Photo - Alamy

April 5, 2010; Oakland, CA, USA; Seattle Mariners right fielder Ken Griffey Jr. (24) hit a

Ken griffey jr seattle mariners hi-res stock photography and images - Alamy

Seattle Mariners' Ken Griffey Jr. wears a single white batting glove during an at-bat in the first inning of a MLB baseball game against the Baltimore Orioles, Tuesday, July 7, 2009, at

Seattle Mariners' Ken Griffey Jr. watches his single to center field against the New York Yankees in the seventh inning at SAFECO Field in Seattle on August 16, 2009. The Mariners beat

Seattle Mariners' Ken Griffey Jr., tosses his bat after hitting a pop fly to center field against the New York Yankees in the seventh inning at SAFECO Field in Seattle on September

Alex Rodriguez and Ken Griffey,jr of the Seattle Mariners pose with Ernie Banks at Anaheim Stadium in Anaheim,California during the 1996 season. (Larry Goren/Four Seam Images via AP Images Stock Photo

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