Derby's American owners have sold the English second-tier club to a local businessman who made a fortune through the "Candy Crush Saga" mobile game.
Former Detroit Pistons executive Andy Appleby fronted the takeover seven years ago by a group of Americans, including investors in baseball, basketball and hockey franchises.
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Within months of their takeover, Derby was relegated from the Premier League and the team has stayed in the Championship since 2008.
Now life-long Derby fan Mel Morris, who bought a 22 percent stake in the team earlier this year, has become the sole owner. Morris stepped down last year as chairman of King Digital, the New York Stock Exchange-listed company which created "Candy Crush."
The annual "Rich List" published by the London-based Sunday Times estimates that Morris is worth 400 million pounds ($610 million).
Five Premier League teams are owned by Americans: Arsenal, Aston Villa, Liverpool, Manchester United and Sunderland.