Conservative media publisher and activist Andrew Breitbart, who was behind investigations that led to the resignations of former Rep. Anthony Weiner of New York and former U.S. Agriculture Department official Shirley Sherrod, has died in Los Angeles. He was 43.

Breitbart’s website, bigjournalism.com, announced Thursday he died of natural causes in Los Angeles. His death was confirmed by breitbart.com editor-in-chief Joel Pollak, who said he was at the hospital, and by the Los Angeles County coroner’s office.

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