E-Mail Threat from someone claiming to be ES

Today I received a E-mail treat from some one claiming to be Erick De*****..in the threat he claimed that "I am back and I am comming after you"...I have retained a copy of this e-mail and will not post it at this point. Everyone needs to be aware of this person and what he does. If the threats continue,I will pass on to proper athorities and let them handle this..I will not back down from telling the truth!