Jesse Curtis Morton pleaded guilty Thursday to threatening "South Park" creators Matt Stone and Trey Parker.
Morton, who converted to Islam several years ago and prefers the name Younus Abdullah Mohammad, pled guilty in a federal court in Virginia.
The charges stem from an 2010 episode of the cartoon show, which depicted the Prophet Muhammad in a bear suit, according to reports. Morton, along with two other people, put the threats on Revolution Muslim, a Website he operates.
Morton and the others were charged with terrorism and Morton fled the U.S. shortly after.
He was caught in Morocco in October and has been in U.S. custody since.
Morton pled guilty to conspiracy, communicating threats and using the Internet to intimidate. One of the others involved already received a 25 year sentence.
The Website has been called the "top catalyst for radicalization for violence in the United States," according to counter-terrorism officials.
Any depiction of the Prophet Muhammad in western media incites threats and even violence.
The offices of Charlie Hebdo, a French satirical newspaper, were set on fire in a firebomb attack last year, one day after the Prophet Muhammad was named editor-in-chief for the latest edition.
The newspaper's latest issue, which was renamed "Sharia Hebdo," was the apparent reason for the attack.
The special edition celebrated the Arab Spring uprisings and protests, Agence France-Presse reported. The cover showed a caricature of the Prophet Muhammad and read "100 lashes if you don't die of laughter!"
No one was injured on the attack, according to reports, but the property damage was significant.
In 2007, two Muslim organizations sued Charlie Hebdo for reprinting cartoons of the Prophet Muhammad that first ran in a Danish Newspaper. The case was later dismissed.
The Danish cartoons sparked violence across the world, including threats and violence against publications that re-printed the original cartoons.
See the image that sparked the threats below.