Billionaire is a top donor rallying behind a 15-year-old girl who suffered severe brain damage when another teen smashed her head against the concrete during a high school fight.The hedge fund investor, 57, contributed $10,000 towards a campaign in support of Kaylee Gain, DailyMail.com can reveal. His donation was confirmed by a partner at Pershing Square Capital Management, L.P.The crowdfunding account, which is raising funds for medical bills and aims to support the teen's family as Gain 'fights hard to stay alive', has received more than $213,000 in donations in just two days.
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