9. Colin Ireland
A former British soldier, Colin Ireland is a man who should not be included in our list of serial killers of the world. You do not think a person formerly charged with the responsibility of guarding morality will turn back and start becoming the problem himself. He decided that the best victim for killing were homosexuals due to their loose lifestyles. Before killing them, he would turn all of their family picture flames away such that he would be seen committing the crime. He in fact committed several of such killings to a point he would dare call the Scottish police to come and arrest him. This man could call the police while on his way to commit the crime. He successfully committed five killings before he was finally caught up by the long arm of the law.