A sentence of life in jail without the possibility of parole can be imposed on criminal defendants found guilty of serious offenses in the U.S. As such, life imprisonment terms can be imposed either for the nature of the offense, in particular the severity of the crime involved, or for the overall pattern of criminal behavior on the part of the defendant. First degree murder convictions can be used to impose people with a sentence of life in jail. Life imprisonment crimes may be punished even more severely with the additional provision of the inability of parole being realized by the convicted individual. Moreover, life in jail might be required for certain kinds of criminal defendants who are found to be particularly important to organized crime activities, such as in the case of people recognized as “drug kingpins,” as well as those who are seen as habitual criminals.