Some people have different problems in life that affect their emotions and their minds. Some of them can deal with these difficulties, but some others are overwhelmed and it can lead to insuperable madness. An extremely case of mental illness is if (develops when) someone becomes a murderer and feels the freedom to kill anyone. But what is the difficulty that can result in it (from it)? This could be related to what happened to Perry Edward Smith, one of the characters of the well-known novel "In Cold Blood  written by Truman Capote. In the story, we get to know the case of Perry and his friend Dick who were executed by hanging on April in 1965 after being found guilty of the deaths of the Clutter family. The dilemma in it is what happens in the mind of a person that can make them to become a serial assassin (an assassin)? This leads us to think and understand the (that there were) factors that took Perry to become a murderer. First, Perry's childhood influenced his future behaviour negatively. Perry's family life during his childhood was very problematic and marked by years of abuse. Perry's mother started to cheat on his father which caused him to become abusive with her and their children. He witnessed beatings of her mother by his father; so as result of domestic violence, his parents divorced; so that Julia, his mother, took Perry and his siblings and moved away, and she became an alcoholic. Due to these problems he run away from home, and he was "in and out of detention homes many times" After this suffering Perry ´s mother died and it made that he (so Perry) and his siblings were (had) to live in an orphanage, where nuns abused him for his difficulty of chronic bed wetting. These violent episodes compelled his bitterness toward other humans and it derived in traumas that marked his childhood's behaviour for his entire life. Second, Perry suffered the lack of family support. Perry represented everything it meant to come