Youngest Guantanamo Detainee Pleads Guilty

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.

Khadr, 24, was accused of throwing a grenade during a 2002 firefight in Afghanistan that resulted in the death of Army Sgt. 1st Class Christopher Speer, a Special Forces medic.

He also admitted that he ""converted landmines to Improvised Explosive Devices and assisted in the planting of ten IEDs with the intent of killing American forces"" in the months before killing Speer, the Pentagon said.

Khadr, the youngest detainee at Guantanamo Bay, was 15 at the time. He faced a maximum sentence of life in prison. He pleaded guilty to murder in violation of the laws of war, attempted murder in violation of the laws of war, conspiracy, two counts of providing material support for terrorism and spying in the United States, a Canadian diplomat said.

Canada -- where Khadr was born -- has been closely involved in negotiations with the United States over his plea.

Discussions have included the possibility that he could serve part of his sentence in Canada, sources told CNN last week.

Pentagon spokesman Col. Dave Lapan said he expects the sentencing phase of Khadr's trial to start Tuesday, adding that it probably will finish sometime this week.

Details of the plea agreement are not made public, Lapan said, because the seven military officers on the jury ""get the case without any knowledge of the pretrial agreement. They will issue a sentence for the record, and after that -- if the judge allows it -- the pretrial agreement can be revealed."" "