2 years for a misdemeanor 5 for a felony.
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There is no specific statute for "threatening another life". The acts could be classified as a violation (harassment) a misdemeanor (menacing & aggravated harassment) or perhaps a felony if the threat was used to gain something (coercion or extortion). The statute of limitations for felonies (except Murder) is 5 years. The Statute of Limitations for a misdemeanor is 2 years.