BAGHDAD, Iraq --

Slideshow (April 2004): Edited Images From Nick Berg Video | Video (April 2004): Berg Killed By Militants (Edited Tape)

The man who gain international infamy when he killed West Chester's Nick Berg in a Web video was tripped up by his last effort on the Internet.

Abu Musab al-Zarqawi, the leader of al-Qaida in Iraq, carried out some of the bloodiest suicide attacks in Iraq and led a campaign of kidnappings and hostage beheadings until he was killed in a U.S. bombing Thursday.

He was the apparent victim of his own hubris after Iraqi leaders said a video he put on the web helped lead them to him.

Al-Zarqawi frequently used the Internet to promote his message of terror, and he first appeared there in April 2004, when he killed Berg in a gruesome scene that brought international condemnation.

The Jordanian-born militant is believed to have personally beheaded at least two American hostages, Berg in April 2004 and Eugene Armstrong in September 2004. The United States put a $25 million bounty on his head, the same amount as al-Qaida leader Osama bin Laden.

In the past year, he moved his campaign beyond Iraq's borders, carrying out a Nov. 9, 2005 triple suicide bombing against hotels in Amman that killed 60 people, as well as other attacks in Jordan and even a rocket attack from Lebanon into northern Israel.

He also sought to expand his attempts to spark civil war between Sunni Muslims and Shiites across the Middle East. He lectured Sunnis to stand up against Shiites in an audiotape posted on the Web last week in which he railed against Shiites for four hours, calling them enemies of Islam.

In April, he released a videotape showing his face for the first time in an apparent attempt to reinforce his image as the leader of Iraq's insurgents and a hero to Sunni extremists across the region.

Iraqi officials said Thursday that tape helped lead U.S. and Iraqi forces to al-Zarqawi.

His group, Al-Qaida in Iraq, claimed to have carried out some of the most prominent and bloody suicide attacks.

Among them were two August 2003 blasts that were seen as marking the start of the insurgency: one against the U.N. headquarters in Baghdad that killed 22 people, including the top U.N. envoy to Iraq, Sergio Vieira de Mello, the other against a Shiite shrine in Najaf that killed more than 85, including Shiite leader Ayatollah Mohammed Baqir al-Hakim.