Nowadays lots of people commit crime, some of them steal, hack information other rape or kidnap but the most awful crime is to murder, society consider murdering the most aggressive act. In most countries people convicted of murder is given a long prison sentence and possibly a life time sentence and in some countries death penalty. In fact, there are many reasons that lead a person to murder which include psychological problems, mental illness, their past and passion First of all, most murders are people with psychological issues that lead them to commit such crimes. ome of them do it just for the pleasure as seeing blood and people suffering makes them happy and people like these are without emotion and sensitivity, this case is considered as a disease called psychopath these criminal are cold-blooded, have no mercy, no feelings toward their victims they are capable to kill without any regrets.