Dec 19 (Reuters) - Freddie Mac, the No.2 provider of U.S. mortgage money, said Chief Financial Officer Ross Kari plans to retire in the second half of 2013.<br /><br />Kari, who was named CFO in October 2009, informed the company of his intention to retire following his 55th birthday, Freddie said in a statement.<br /><br />Earlier this year, Freddie named Donald Layton, former head of E*Trade Financial Corp, as its new chief executive officer replacing Charles Haldeman.