Bang-Bang (S06E23)

Mrs. Cutler is found dead, shot through the mouth, in her own home, which shows no signs of forced entry or disturbances. Her husband, Mr. William Cutler, is missing, only to be found later, alive, at his office where all of his co-workers were shot dead. He left the bloody scene with only a minor injury. All of this quickly becomes a hostage situation when Mr. Cutler, after shooting a security at a casino, holds a woman hostage. (USA Network)