Aris Sumarsono, 58, better known as Zulkarnaen, is the former military commander of Jemaah Islamiyah, a Southeast Asian militant group with ties to al-Qaida which the U.S. has designated a terrorist group. The group is widely blamed for attacks including the 2002 bombings on the Indonesian resort island of Bali that killed 202 people, mostly foreign tourists, as well as attacks in the Philippines.