Justin Bieber -- 14-Year-Old Threatens To Kill His Ex

[NelsonG]

Filed under: [url="http://www.tmz.com/person/justin-bieber/"]Justin Bieber[/url], [url="http://www.tmz.com/person/selena-gomez/"]Selena Gomez[/url], [url="http://www.tmz.com/person/caitlin-beadles/"]Caitlin Beadles[/url], [url="http://www.tmz.com/category/celebrity-justice/"]Celebrity Justice[/url]

[url="http://tmz.vo.llnwd.net/o28/newsdesk/tmz_documents/1107_search.pdf"][img]http://ll-media.tmz.com/2011/11/07/1107-search-warrant-ex.jpg[/img][/url]
The LAPD got a search warrant against someone who was after [b]Caitlin Beadles[/b] --[b] [url="http://tmz.com/person/justin-bieber/"]Justin Bieber[/url][/b]'s former GF ... someone who wanted to skin her alive ... and the perp is a 14-year-old girl.

According to [url="http://tmz.vo.llnwd.net/o28/newsdesk/tmz_documents/1107_search.pdf"][b]the warrant[/b][/url] -- obtained by TMZ -- someone went on tumblr.com, a social media website, using the name [b]KILLSGANDCB[/b] -- we're guessing it means kill [url="http://tmz.com/person/selena-gomez/"][b]Selena Gomez[/b][/url] and Caitlin Beadles.   The perp said she was going to "murder" Beadles and had cameras trained on her 24/7, ominously promising the victim won't know what's coming until she "wakes up on the other side of her bed with a knife."

TMZ has learned ... the suspect is a 14-year-old girl who lives in Kentucky who is developmentally disabled.  We're told LAPD detectives contacted her mother, who is now closely monitoring her internet activities.

Meanwhile, Selena's alleged stalker, [b]Thomas Brodnicki[/b], remains in jail on felony stalking charges and cops say he's a real threat to her.
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