Omar Khadr, right, with his lawyer, Dennis Edney Canadian-born Omar Khadr confessed that as an al-Qaida fighter in Afghanistan at the age of 15, he killed U.S. Army Sgt. First Class Christopher Speer and severely injured another American soldier with a hand grenade. U.S. Army Sgt. First Class Christopher Speer Khadr was captured at an al-Qaida…