Robert Carradine, the actor best known for playing Sam McGuire in 'Lizzie McGuire' had died aged 71. A statement released by his family said the actor took his own life after living with bipolar disorder for almost two decades. His brother Keith told Deadline: "We want people to know it, and there's no shame in it." Following his death, Lizzie McGuire star Hilary Duff posted a tribute to Carradine on Instagram: "This one hurts. 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 by my on-screen parents. I’ll be forever grateful for that." "I’m deeply sad to learn Bobby was suffering. My heart aches for him , his family, and everyone who loved him." #HilaryDuff #LizzieMcGuire #RobertCarradine