S7·E20 Lines of Fire

Emmet Carey is holding his two children hostage in the apartment of his wife's sister. He sees MGee on television and decides that he will talk only to him and occasionally Gharty who is also on the scene. The wife also shows up on the scene and gets past the security. Her screaming sets of Emmet, who fires two shots out that window that strike his wife dead. MGee has to keep the information from him as they continue to negotiate. The crisis ends when Emmet releases his stepdaughter, but makes a deadly choice for himself and his son.