Hale, 49, has coached under Melvin for three seasons in Oakland and also worked with him in Arizona as a third-base and infield coach. Prior to that, he enjoyed seven seasons as a Minor League manager in the D-backs' system.
His lengthy history in Arizona extends back to his college days. Hale attended the University of Arizona and still resides in the state in the offseason. But he has plenty of ties to the Twins organization, too.
Minnesota drafted Hale in 1987, and he played 319 games for them between 1989 and '96.
Hale was one of five finalists for the Mariners' managerial job last year, ultimately given to Lloyd McClendon. He also interviewed with Seattle in '08 -- when the Mariners hired former A's coach Don Wakamatsu -- and has been a contender for several other openings in recent years.
Each of Melvin's other coaches are expected back next year.
Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.