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"They have been seeing each other for five and half years," says the friend. "Chris and Dana (Reeve) loved him. He was very close to them and their family."
Alexandra, 23, and Garren, 25, are former classmates at Yale.
Alexandra, who currently attends law school in New York City, also serves on the board – along with her brother Matthew – of the Christopher Reeve Foundation, founded by their father after his 1995 horse-riding accident to fund research for cures and therapies for paralysis.
Reeve's mother is British mental health counselor Gae Exton.
JOSH & FERGIE: ROCKED BY SCANDAL
Did he cheat with a stripper?
Married less than a year, the couple denies an Atlanta woman’s claims that she and Josh had a fling
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