What is cerebral palsy that RJ Mitte was diagnosed with. Breaking Bad actor RJ Mitte, who died at 34, was diagnosed with Cerebral Palsy at three years old. It is a group of disorders affecting movement, muscle control, balance and posture, caused by abnormal brain development or damage to the developing brain. Symptoms include weak muscles, difficulty walking, and swallowing problems. There is no cure, but treatment can improve function.