Serial killers are roughly defined as unremorseful killers who kill for pleasure. Many serial killers show signs of being psychologically corrupt at a young age. Although, many researchers do not understand why some children exhibit abnormalities and turn out to be productive members of society and some exhibit similar abnormalities that develop into psychological disarray. This paper will examine the extent to which past experiences during childhood affect how serial killers became what they are. The past lives of serial killers will be explained and analyzed to see how these people turned out to be such brutal murderers. Theories will then be applied to their past lives in order to thoroughly analyze the reasons for murder. Some researchers