Conspiracy theorists claim Barack Obama is behind blogger Andrew Breitbart's death

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Right wing conspiracy theorists in the United States have now unleashed themselves on Twitter claiming President Barack Obama is behind conservative blogger Andrew Breitbart's death at 43.

However, reputed news sources claim Breitbart, a larger-than-life author and publisher, died unexpectedly of natural causes in Los Angeles on Thursday.

Theories claim Breitbart was in the possession of 'a video' that could've 'threatened' Obama's political career and the President 'had him taken care off'.

Website Buzzfeed.com has so far tracked 25 tweets claiming a conspiracy.

Breitbart, a brash and outspoken writer and blogger, who was influential in U.S. Republican politics, was the center of several major news websites, including www.Breitbart.tv [2], www.breitbart.com [3] and www.biggovernment.com [4].

"We have lost a husband, a father, a son, a brother, a dear friend, a patriot and a happy warrior. Andrew lived boldly, so that we more timid souls would dare to live freely and fully, and fight for the fragile liberty he showed us how to love," a memorial page on his websites said.

The page said Breitbart 'passed away unexpectedly from natural causes'. A representative for breitbart.com confirmed his death in an e-mail.

Larry Bietz, the watch commander at the coroner's office, said it had received a report that Breitbart died at UCLA Medical Center but that the office had not yet received his body.

"I can confirm that it's been reported to us that he died," he said.

Breitbart reportedly collapsed when walking near his house, according to the Associated Press, which cited his father-in law.

Breitbart was notorious for his fiery opinions. The last posts from his Twitter feed appear to have come just moments before midnight, with one calling a user a 'putz' and another replying 'Apologize for WHAT?' to another user.

His work played a role in a number of prominent news stories over the years, including undercover videos of the community group ACORN and the texting scandal of former Democratic U.S. Representative Anthony Weiner of New York.