Mr. Spann was killed after questioning Mr. Lindh, although the government did not provide any evidence that Mr. Lindh had participated in the revolt. During the trial, he pleaded guilty to supporting the Taliban and carrying a rifle and grenade.
John Spann, father of Mr. Spann, is still disappointed with the outcome of the trial of Mr. Lindh.
"We have a traitor I've been given for 20 years, and I can not help it," said Mr. Spann, a real estate broker in Winfield, Ala., Previously on The Times. "He was sentenced to 20 years imprisonment when it should have been life in prison."
Mr. Lindh is prohibited from owning a passport and also traveling internationally, which prevents the immediate possibility of moving to Ireland. Mr. Lindh was granted Irish citizenship by his grandmother in prison.
Under the conditions of his release, he also has to undergo psychological counseling.
At his sentencing in late 2002, Mr. Lindh said he clearly condemned "terrorism" in every respect "and made a mistake in joining the Taliban. However, recent reviews indicate that he may not have completely rejected extremist views.
A 2017 National Counterterrorism Center report, first published by Foreign Policy magazine, said that Mr. Lindh continued to champion global jihad and author and translator of violent extremist texts last year.
A further assessment by the Bureau of Prison in 2017 showed that he had made supporting statements about the Islamic state.