Ken Griffey Jr. has decided to return to the Seattle Mariners.

“He’s coming home,” General Manager Jack Zduriencik confirmed on Wednesday night. “I can’t begin to tell you how ecstatic we are. He is, too.”

The contract for Griffey, 39, is for one year and is believed to be worth $2 million in base salary, plus incentives. Atlanta was originally thought to be Griffey’s choice on Tuesday because the Braves’ spring training camp is near the Griffey family home in Orlando, Fla., and Atlanta is about an hour away by air. Instead Ken Griffey Jr chose to honor the promise made two years ago to finish his career as a Mariner.

Ken Griffey Jr. completed his perfect power stroke and watched the ball fly on his 600th homer before rounding the bases. Griffey became the sixth player in history to reach 600 homers with a drive off Mark Hendrickson in the first inning of the Cincinnati Reds victory over the Marlins. Griffey joined Barry Bonds, Hank Aaron, Babe Ruth, Willie Mays and Sammy Sosa as the only players to reach the mark.

The 38-year-old Griffey homered with Jerry Hairston on third and one out. The left-handed slugger launched a 3-1 pitch 413 feet into the seats. Griffey got a standing ovation from the crowd of 16,000 and acknowledged the crowd by coming out of the Reds dugout and waving his helmet to the fans.