A family is murdered in cold blood and one girl is left to tell the story. This is the episode of a man going off the deep end and justice was served.

https://en.wikipedia.org/wiki/2014_Harris_County_shooting

https://murderpedia.org/male.H/h/haskell-ronald-lee.htm#:~:text=The%20victims%20included%2039%2Dyear,to%20attack%20her%20grandparents%20next.