Robert Carradine's Brother Keith, Family Shine Light on How He Died, Mental Illness

Robert Carradine's brother, Keith Carradine, and his family are sharing his struggle with mental illness in the wake of Robert Carradine's death.

According to Keith Carradine, his brother, who was known for starring in Revenge of the Nerds, struggled with bipolar disease. What was Carradine's cause of death? His family is being open about how he died. Carradine "killed himself after years of living with bipolar disorder," The Guardian reported. Robert and Keith are the sons of actor John Carradine.