CBS

Season 11: Episode 10 - 418/427

418/427: The wife of an FBI agent is murdered in a supermarket parking lot and his two children appear to have been kidnapped by a serial pedophile who the agent has been after for years. Our CSI team soon finds the agent was involved in his wife's murder and race to find the little girl when they realize her schizophrenic brother has taken her. The agent and his wife were in the middle of a messy divorce and he wanted her out of his life. The agent who obsessively tracked a serial pedophile for years tries to frame the pedophile for his wife's murder. The pedophile is found dead and the team realizes the agent's schizophrenic son killed him and took his little sister fearing for her safety when he began to have hallucinations that the pedophile was after them and killed his step-mom.