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.

Kate Gosselin was the target of menacing messages on Twitter recently, and RadarOnline.com has learned that the person behind the tweets has been plotting their sinister campaign for at least a year.

The creepy tweets come from a profile displaying Bible verse John 8:32 (And you will know the truth, and the truth will set you free) and warn Kate about an upcoming deadline: “56 more days Kate!! It's not too late to change your ways. Follow us for updates!”

Mel Gibson is under fire again, accused of more anti-Semitism, this time from a Hollywood screenwriter who says he was the recipient of repeated hateful rants from the foul-mouthed star.

Joe Eszterhas, who was slated to write the screenplay for the Gibson project The Maccabees, wrote a scathing letter to Mel where he leveled the claim that Gibson “hates Jews,” called the Holocaust “horses**t” and threatened to have his ex killed.

New year, same old troubles for Teen Mom's Jenelle Evans.

The embattled North Carolina native, 20, was arrested Tuesday in connection with "communicating threats" and making "harassing phone calls" to her one-time roommate Hannah Inman, RadarOnline.com has learned.

Evans, who's had multiple run-ins with the law, was released from custody after posting $1,000 bond. She took to Facebook to address her latest legal dust-up.

"Yes I was arrested again. It's okay, Hannah's just calling her own bluffs," Evans wrote. "How can I harass u with phone calls when u clearly don't own a cell phone? I've dropped this argument weeks ago. Haven't been paying attention to u but u have the balls to tell yr little 'fans'.. 'imma f***ing kill that bitch' ?! How's [sic] threatening who here?!"

Real Housewives of Beverly Hills star Taylor Armstrong finally decided to file for divorce from her then-husband, Russell Armstrong, because executives at Bravo had implemented a ban prohibiting the couple from appearing on the hit show after Russell sent executives legal letters threatening to sue, RadarOnline.com is exclusively reporting.

As RadarOnline.com previously reported, the tension on this season's Real Housewives Of Beverly Hills hit a fever pitch on Tuesday night, as the cast asked Taylor and Russell to leave a party, upon learning he threatened to sue Camille Grammer for her talk of his alleged abusive behavior toward Taylor.

But Kelsey Grammer's ex-wife wasn't the only recipient of letters threatening legal action from Russell.

Terrence Howard's estranged wife has obtained a temporary restraining order against him and RadarOnline.com has the documents detailing her claims of death threats and beatings by the actor.

According to the legal papers, Michelle Howard claims Terence began abusing her just seven days after their January 2010 wedding.

CLICK HERE TO READ THE LEGAL DOCUMENTS

There's nothing like having two guys fight for your attention.

Reality star Audrina Patridge's on – off - on boyfriend Corey Bohan is once again showing off his bad boy credentials - this time by threatening a guy Patridge dated during the time the volatile couple had split.

PHOTOS: Audrina Patridge's Sizzling Hot Bikini Shoot

One day before a new episode of Patridge’s reality show Audrina aired, which showed her getting up close and personal with polo star Nic Roldan, Boham lashed out via Twitter and threatened his competition.

Bad Girls Club star Kristen Kelly was recently bullied while walking down the street by fellow Bad Girl Lea Lorraine, and only RadarOnline.com has all the exclusive details.

"Kristen was walking down Beverly Blvd. in Los Angeles while on an important business call when suddenly a black Scion screeched around and made an illegal U-turn," an eyewitness told RadarOnline.com.

"It was Lea and she started screaming at Kristen, 'You f**king b**ch! You ugly b**ch! I'll kill you! I know where you live! Come here and fight me! Fight me!'"