Guantanamo Bay detainee Omar Khadr pleaded guilty to charges against him Monday , the Pentagon said , in the first military commission trial there since Barack Obama became president . NEW : Plea deal includes an eight-year prison sentence , source says . Khadr , 24 , accused of throwing a grenade that killed a Guantanamo medic in 2002 . Khadr was born in Canada , which held negotiations over his plea . It 's the 1st Special Forces military commission of the Guantanamo Bay era .
NEW : Plea deal includes an eight-year prison sentence , source says . Khadr , 24 , accused of throwing a grenade that killed a Guantanamo medic in 2002 . Khadr was born in Canada , which held negotiations over his plea . It 's the 1st Special Forces military commission of the Guantanamo Bay era .