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Colleen R. LaRose pleaded guilty to plotting to kill Swedish artist Lars Vilks. ((Green County Jail/Associated Press))

A Pennsylvania woman who called herself "Jihad Jane" online has pleaded guilty in Philadelphia to her role in a global terror plot.

U.S. prosecutors said 47-year-old Colleen LaRose had agreed to kill a Swedish cartoonist who had offended Muslims. They said the suburban Philadelphia woman helped foreign terror suspects intent on starting a holy war in Europe and South Asia.

LaRose has been in custody since October 2009 and faced a possible life sentence under charges in the March 2010 indictment.

She and co-defendant Jamie Paulin-Ramirez of Leadville, Colo., are the rare U.S. women charged with terrorism. Paulin-Ramirez has pleaded not guilty since she was arrested in Ireland with other terror suspects in March.