Hilary Duff is mourning the loss of her TV dad following the tragic death of Robert Carradine . Duff, who played his onscreen daughter in "Lizzie McGuire," shared an emotional Instagram tribute Monday night after Carradine's family confirmed he died, taking his own life following a nearly two-decade battle with Bipolar Disorder. "This one hurts," Duff wrote. "It's really hard to face this reality about an old friend. There was so much warmth in the McGuire family and I always felt so cared for

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