Duane "Dog the Bounty Hunter" Chapman and his family have been the target of threatening and terrifying e-mails the past few weeks, leading to an FBI investigation, RadarOnline.com has learned exclusively.   The source of the e-mails sent the disturbing communications over four days, threatening murder, rape, kidnapping and other horrific, unspeakable acts.    EXCLUSIVE DOCUMENTS: Read The Terrifying Dog The Bounty Hunter Emails go to http://www.radaronline.com/exclusives/2012/05/dog-bounty-hunter-email-death-threats-duane-chapman-fbi   On April 30, Dog received an email that read: "I'm going to murder you. I'm going to come to Hawaii and murder you and your family in cold blood. You are next on my list and are the bane of society. I will deliver you to God."   Then, on May 2, Another email arrived and read: "I'm going to murder you and your family. I'm going to slaughter your family. I'm going to cut the fat t**s off your wife while I watch your children bleed.   "I want to see you cry, like you did everyday in prison. I want you to watch as your family gets massacred right in front of you Then I'm going to f**k you in the a** with your f****t indian beads."   HOTOS: Stars Who Have Been Stalked   A day later, on May 3, The emailer wrote: "Your children looked nice today. As previously stated, I have a rather nasty vendetta against you and your family. I know this goes through contacts; and they may be the bane to your saving. I encourage you to thank them after I have your family tied up and gagging.   "I can't wait to rape your daughters. Feel them get blasted by my c*m. It will feel so great. The blood of the innocent gets me so hard. Bye Duane.   The Chapmans responded to these reports  5/17/12 STATEMENT FROM THE CHAPMANS   The Chapmans are taking these threats seriously and are very concerned about the safety of their family.  Duane Chapman said that when the person responsible is found, he will prosecute to the full extent of the law for the threats made against his family.   A referral of the case has been made to the FBI in Honolulu.   The Chapmans are unavailable for further comment at this time.